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?

[]Mohanlal] is an Indian actor, producer, and singer who has starred in both blockbuster and art house films for independent filmmakers.  During his career, he has appeared in more than 340 feature films, primarily in Malayalam cinema but also in other languages including Hindi, Tamil, Telugu, and Kannada.  In 1978, when he was 18, he started acting with a minor comedic role in the unreleased film "Thiranottam", before making screen debut in 1980 as antagonist in the romance film "Manjil Virinja Pookkal".  His portrayal of Narendran, a sadistic husband, received recognition and the film developed a cult status in Malayalam cinema.  Subsequently, Mohanlal was cast as the antagonist in many films.  His first positive role was in "Padayottam" (1982), the first 70 mm film in Malayalam.  In 1984 he starred in "Poochakkoru Mookkuthi", a comedy film whose success triggered a trend and popularised the genre in the 1980s.  In an early critically acclaimed performance, Mohanlal played an antihero in the I. V. Sasi-directed thriller "Uyarangalil" (1984).  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). <SEP>  It tells the story of Fievel Mousekewitz and his family as they emigrate from Russian Empire-controlled territory of Ukraine to the United States for freedom.  However, he gets lost and must find a way to reunite with them. 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.  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.  The success of it, "The Land Before Time", and Disney's "Who Framed Roger Rabbit", as well as Bluth's departure from their partnership, prompted Steven Spielberg to establish his own animation studio, Amblimation. <SEP>  The film is based on Gary K. Wolf's 1981 novel "Who Censored Roger Rabbit? " The film stars Bob Hoskins, Christopher Lloyd, Charles Fleischer, Stubby Kaye, and Joanna Cassidy.  Combining live-action and animation, the film is set in Hollywood during the late 1940s, where animated characters and people co-exist.  The story follows Eddie Valiant, a private detective who must exonerate "Toon" Roger Rabbit, who is accused of murdering a wealthy businessman. Who Framed Roger Rabbit is a 1988 American live-action/animated fantasy film directed by Robert Zemeckis, produced by Frank Marshall and Robert Watts, and written by Jeffrey Price and Peter S. Seaman. <SEP> Morris Francis Sullivan (December 8, 1916 – August 24, 2008) was an American businessman who co-founded the Sullivan Bluth Studios with three former Disney animators.  Sullivan Bluth Studios employed approximately 400 people at the peak of its success.  Under Sullivan's direction, the former animation studio created such films as "The Land Before Time" and "An American Tail".