How to serve an already coded html page in a WP page, to assign a simpler url

If i’m understanding correctly. You would be just bypassing wordpress all together right?

There is nothing to keep you from putting files in your web directory and then navigating to “http://yoursite.com/test.html“. To keep from making a mess of your root directory I’d recomend putting them into a folder so your path would look more like “http://yoursite.com/secondsite/index.html

Are you wanting to WordPress to interact with these files, or are they essentially a stand alone website?