Conversation so far:
Where did Will Forte start his career?
Will Forte began his career taking classes at the Groundlings in Los Angeles, an improvisational and sketch comedy troupe and school, and writing a comic book.
What did Will Forte do at the Groundlings?
Will Forte took classes in improv acting and comedy.

Question: What did he do after the Groundlings?
Self-contained rewrite: What did Will Forte do after classes at the Groundlings?