Shakespeare wrote about the human condition - he pushed boundaries by writing plays that appealed to everyone, not just the rich. And he even abandoned traditional verse structure at times. When there weren't the words to say what he wished, he created new ones. When he felt a story needed telling,...
The "ex" root also means "not", and "except" means everything, but NOT the "exception".
The thesis should end your introductory paragraph. It can be a simple "Elito uses technique A, B, and C to demonstrate this idea" of more complicated, like "while such and such can be the case, ultimately Eliot argues that so on and so forth."
If you want to use an active verb, then "composing" is the correct choice. You can also say "who compose", but it is less concise.