Javascript how to get the length of an Array that is nested inside an Array, that is inside an Object?

I am trying to get the length of an array that is inside an array, that is inside an object.

Here is the code I am working with:

var experience = document.getElementById('experience');

for (i = 0; i < resumeData.experience.length; i++){
    var experienceEntryDiv = document.createElement('div');
    experienceEntryDiv.className = "experienceEntryDiv";
    var entryTitle = '<h1>'+resumeData.experience[i].title+'</h1>';
    var entryOrganization = '<h2>'+resumeData.experience[i].organization+'</h2>';
    var entryYears = '<h1 class="text-right"><small>'+resumeData.experience[i].startYear+' - '+resumeData.experience[i].endYear+'</small></h1>';

    for (j = 0; j < resumeData.experience.descriptions.length; j++){
        var entryDescription = '<li>'+resumeData.experience[i].descriptions[j]+'</li>';
        entryDescriptions.appendChild(entryDescription);
    }
    var entryHTML = 
        '<div class="entry">'+
        '<div class="row">'+
            '<div class="col-md-9">'+entryTitle+entryOrganization+'</div>'+
            '<div class="col-md-3">'+entryYears+'</div>'+
        '</div>'+
        '<div class="row">'+entryDescriptions+'<hr /></div>'+
        '<hr /></div>'+
        '<br />';
    experienceEntryDiv.innerHTML = entryHTML;
    experience.appendChild(experienceEntryDiv);
    }

This is what my data looks like:

    var resumeData = {

        experience: [
    {
        title: 'Title',
        organization: 'Company Name',
        startYear: 2017,
        endYear: 2017,
        descriptions: [
            'Using code stuff',
            'Used more code stuff'
        ]
    },
    {
        title: 'Title',
        organization: 'Company Name',
        startYear: 2017,
        endYear: 2017,
        descriptions: [
            'Using code stuff',
            'Used more code stuff'
        ]
    },
    {
        title: 'Title',
        organization: 'Company Name',
        startYear: 2017,
        endYear: 2017,
        descriptions: [
            'Using code stuff',
            'Used more code stuff'
        ]
    },
    {
        title: 'Title',
        organization: 'Company Name',
        startYear: 2017,
        endYear: 2017,
        descriptions: [
            'Using code stuff',
            'Used more code stuff'
        ]
    },
    {
        title: 'Title',
        organization: 'Company Name',
        startYear: 2017,
        endYear: 2017,
        descriptions: [
            'Using code stuff',
            'Used more code stuff'
        ]
    },
    {
        title: 'Title',
        organization: 'Company Name',
        startYear: 2017,
        endYear: 2017,
        descriptions: [
            'Using code stuff',
            'Used more code stuff'
        ]
    }
],

I can target the array called "experience" with

resumeData.experience.length

However, when I try to target the "descriptions" array within the "experience" array with:

resumeData.experience.descriptions.length

the entire section disappears.

I tried using:

resumeData.experience[4].length

and that doesn't work.

Any help would be really appreciated!

Thanks!

** EDIT #2 **

After the recommendation, I adjusted the code to be as follows, but I only see

[object HTMLUListElement]

in place of the UL text that should be there. Here is what the code looks like now:

var experience = document.getElementById('experience');
var entryDescriptions = document.createElement('ul');


for (i = 0; i < resumeData.experience.length; i++){
    var experienceEntryDiv = document.createElement('div');
    experienceEntryDiv.className = "experienceEntryDiv";
    var entryTitle = '<h1>'+resumeData.experience[i].title+'</h1>';
    var entryOrganization = '<h2>'+resumeData.experience[i].organization+'</h2>';
    var entryYears = '<h1 class="text-right"><small>'+resumeData.experience[i].startYear+' - '+resumeData.experience[i].endYear+'</small></h1>';

    for (j = 0; j < resumeData.experience[i].descriptions.length; j++){
        descriptionCounts = resumeData.experience[i].descriptions.length;
        console.log(descriptionCounts);
        var entryDescItem = document.createElement('li');
        entryDescItem.className = "entryDescItem";
        var entrydesc = document.createTextNode(resumeData.experience[i].descriptions[j]);
        entryDescItem.appendChild(entrydesc);
        entryDescriptions.appendChild(entryDescItem);
    }
    var entryHTML = 
    '<div class="entry">'+
    '<div class="row">'+
        '<div class="col-md-9">'+entryTitle+entryOrganization+'</div>'+
        '<div class="col-md-3">'+entryYears+'</div>'+
    '</div>'+
    '<div class="row"><ul>'+entryDescriptions+'</ul><hr /></div>'+
    '</div>'+
    '<br />';
    experienceEntryDiv.innerHTML = entryHTML;
    experience.appendChild(experienceEntryDiv);
}