Conversation so far:
Where did Julia Louis-Dreyfus begin her early career?
As part of her comedic training, Julia Louis-Dreyfus appeared in The Second City, one of Chicago's best-known improvisational theatre groups, whose alumni include Alan Arkin and Steve Carell.
Who else was part of The Second City improvisational theatre group besides Julia Louis-Dreyfus, Alan Arkin, and Steve Carell?
The Second City alumni include Stephen Colbert, Tina Fey, Amy Poehler, Shelley Long, John Belushi, Dan Aykroyd, Bill Murray, John Candy, Chris Farley, Bob Odenkirk and many, many others.

Question: When did she get another big break in her career?
Self-contained rewrite: When did Julia Louis-Dreyfus get another big break in her career besides her time with The Second City?