To Revert to the original post, content follows the below process.

Step One: Open Posts menu, and click on post name to edit the article.

Once post is open in edit mode scroll to the very bottom of the page. there will be a section by name "WP Auto Rewriter", please refer below screenshot 

Then Click on the Orignal Article tab, and click on the "Restore Orignal Article content" button. refer below screenshot.

Once clicked original article content which is not rewritten will be restored and you will be able to use it by clicking on the update button to save the post.