If you come up with a way to automagically translate things into easier English you could probably sell it to various UK government / NHS / etc organisations, who all have a duty to make much of their communication available in "Easy Read".

Here's the Equality Act Easy read version: https://www.gov.uk/government/uploads/system/uploads/attachm...

And the Equality Act non-easy read: http://www.legislation.gov.uk/ukpga/2010/15/contents

Here's a Google search for some easy read documents: https://www.google.co.uk/search?site=&source=hp&q=easy+read+...

Here's Mencap's (a charity that works with people with learning disability) guide to Easy Read: https://www.mencap.org.uk/make_it_clear

Similarly, in the U.S. there is the Plain Writing Act of 2010 (http://www.plainlanguage.gov/plLaw/).

For the latter, a dictionary?