Conversation so far:
Where did Julia Louis-Dreyfus begin Julia Louis-Dreyfus's early career?
As part of her comedic training, Louis-Dreyfus appeared in The Second City, one of Chicago's best-known improvisation theatre groups.
Who else was part of this group?
The Second City, one of Chicago's best-known improvisation theatre groups (whose alumni include Alan Arkin, Steve Carell, Stephen Colbert, Tina Fey, Amy Poehler, and Shelley Long).
When did she get another big break in her career?
her performance with The Practical Theatre Company at their "Golden 50th Anniversary Jubilee" that led to her being asked to join the cast of NBC's Saturday Night Live.

Question: When did she go to SNL?
Self-contained rewrite: When did Louis-Dreyfus go to SNL?