test.html

<div>
  <div>
    <p>
      Introduction
    </p>
  </div>
  <div>
    <div>
      <p>
        Body paragraph 1
      </p>
      <p>
        Body paragraph 2 related to p1
      </p>
      <p>
        Body paragraph 3 related to p1
      </p>
    </div>
    <div>
      <p>
        Body paragraph 4
      </p>
      <p>
        Body paragraph 5 related to p4
      </p>
      <p>
        Body paragraph 6 related to p4
      </p>
    </div>
  </div>
  <div>
    <p>
      Conclusion
    </p>
  </div>
</div>