Simple English Wikipedia is an edition of the open-source encyclopedia designed to be intelligible to small children, adults with learning disabilities, and people who are learning English.  It is also an entertaining read, because the simple language often makes things silly. I found the article on Keynesian economics to be particularly silly and entertaining:

Keynesian economics (also called Keynesianism) describes the economics theories of John Maynard Keynes. Keynes wrote about his theories in his book The General Theory of Employment, Interest and Money. The book was published in 1936.
Keynes said capitalism was a good economic system. In a capitalism system, people earn money from their work. Businesses employ and pay people to work. Then people can spend their money on things they want

Read the full article.