I want to use Split.js for creating my specific layout like
<div id="a" class="split split-horizontal">
</div>
<div id="b" class="split split-horizontal">
<div id="d" class="split content"></div>
<div id="e" class="split content"></div>
<div id="f" class="split content"></div>
</div>
<div id="c" class="split split-horizontal">
</div>
<script>
Split(['#a', '#b', '#c'], {
gutterSize: 20,
cursor: 'pointer'
});
Split(['#d', '#e', '#f'], {
direction: 'vertical',
sizes: [15, 70, 15],
gutterSize: 20,
cursor: 'row-resize'
});
</script>
but above code does not work.
Can anyone help me?
How can I create the layout with Split.js because does not exist any sample like that in their site?

You where pretty close. First of all you didn't add
contentclass to the left/right pain, so they didn't show. Then you mixed up the horizontal split. Here's a working fiddle.