Note: the assertion that the experience of plague caused Shakespeare to change the ending of King Lear is really just speculation by one scholar. The evidence is circumstantial in the extreme. We know rather little about Shakespeare’s biography or inner life, and after two centuries of people combing over every scrap of archival evidence they can find we are not likely to discover much more. Which is fine by me reall…
Can you suggest a plain English adaption of his works ?
Better, I think, is to see a good film adaptation. Shakespeare was never intended to be read, but to be performed. There's a lot in the text that isn't apparent until you've studied it closely, but a good performance will bring it right out in the open.
A few films that I'd suggest to get started with:
https://en.wikipedia.org/wiki/Henry_V_(1989_film) https://en.wikipedia.org/wiki/Much_Ado_About_Nothing_(1993_f... https://en.wikipedia.org/wiki/Richard_III_(1995_film) https://en.wikipedia.org/wiki/Titus_(film) https://en.wikipedia.org/wiki/Coriolanus_(film) https://en.wikipedia.org/wiki/Romeo_%2B_Juliet https://en.wikipedia.org/wiki/Hamlet_(2000_film)
These are all good, accessible versions of his plays. You don't need to be an expert to understand and enjoy them. (They're very roughly in order of my favorites, if that matters to you.)
I won't guarantee you'll like them. There's really nothing wrong with that. People get snobby about Shakespeare, and they shouldn't. It's OK to say, "Yeah, it's not for me". But under all the snobbery, there really is great text and great performances that people genuinely enjoy. If you're interested in that, these films are the places I'd start.