JSFiddle - React, Tailwind, and code Playground

HTML

<div class="content">
  <h2>Lorem</h2>
  <div>
    <p>ipsum dolor sit amet</p>
    <p>ipsum dolor sit amet</p>
    <p>ipsum dolor sit amet</p>
  </div>
  <h2>Lorem</h2>
  <div>
    <p>ipsum dolor sit amet</p>
    <p>ipsum dolor sit amet</p>
    <p>ipsum dolor sit amet</p>
    <p>ipsum dolor sit amet</p>
  </div>
</div>

JavaScript

$('div.content h2').each(function() {
    $(this).next('div').children('p:odd').after('<div class="clearfix">xxx</div>');				
});