Question: Who was the director of the film whose success, along with that of An American Tail and The Land Before Time, prompted Steven Spielberg to establish his own animation studio?
Sentence (from "An American Tail"): It was released on November 21, 1986, to reviews that ranged from positive to mixed and was a box office hit, making it the highest-grossing non-Disney animated film at the time.
Relevant evidence: No