Question: Bartholomew JoJo "Bart" Simpson is a fictional character in the American animated television series "The Simpsons", he is voiced by Nancy Cartwright and first appeared on television in "The Tracey Ullman Show", is an American television variety show starring Tracey Ullman, it debuted on which date?
Sentence (from "Homer Simpson"): Groening had been called to pitch a series of shorts based on his comic strip "Life in Hell" but instead decided to create a new set of characters.
Relevant evidence: No