Morris Sullivan was the founder of the studio that created what 1986 animated musical adventure film?
Morris Sullivan:  Under Sullivan's direction, the former animation studio created such films as "The Land Before Time" and "An American Tail". An American Tail: An American Tail is a 1986 American animated musical adventure family comedy-drama film directed by Don Bluth and produced by Sullivan Bluth Studios and Amblin Entertainment.
An American Tail