Rewordify.com is powerful, FREE, online reading comprehension and vocabulary development software. It helps students understand difficult English faster, helps them learn words in new ways, and helps teachers create high-interest learning materials from any English text passage. It also has no ads and is a school-safe learning environment.

How it works: paste or enter a block of text (or a Web page url) and Rewordify finds the hard words and phrases, highlights them, and provides a simplified alternative. The harder the text the better.

Check out the Rewordify Teacher Page 

Check out this video on how Rewordify works