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 "Mohanlal filmography"): In the same year, he co-founded Casino Films, a motion picture production company which later produced his popular comedies "Gandhinagar 2nd Street" (1986) and "Nadodikkattu" (1987).
Relevant evidence: No