How to include a pure HTML to about us template

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Dear team member, 

I need to include a complex historical timeline into about page (I use the Palo Alto theme). I have created a new  page template with HTML code only, then created a new page based on this template and added a CSS code to the theme.css file. In preview. The page looks fine.  However, I need to include this HTML timeline into a standard page that offers several sections, product feature, rich text, and text with image. 

I tried to insert the HTML code directly to the page editor, however, the custom HTML always appears at the bottom, just above the footer. I need it to appear between standard sections. 

Is there anyway to achieve this in a simple way?

Thank you in advance,