where did you hear this?
I can't quite remember exactly what place, but I do recall reading that Shakespeare coined many new terms, and that his plays were both hard to understand and difficult to follow for the common man. Only the upper-class people were able to follow them to some degree, but still had to guess the meaning of quite a number of words because Shakespeare made up quite a few.
A quick Google query turns
this site up, but as it says, "How many of these are true coinages by "the Bard", and how many are simply the earliest written attestations of a word or words already in use, I can't tell you."
The book I recall reading simply declared the common folk couldn't at all follow his plays, and the higher classes needed to use some effort.
Mind you, Queen's English as a whole in that time was incomprehensible for the common man. Not to say Shakespeare's work was written in Queen's English (my knowledge herein falls short), but since I read both those things I am wont to believe that commoners didn't understand Shakespearian English.
He went through this version most likely.
Well played, good sir.