Complex sentence: He spent about a year at the University of Minnesota studying both philosophy and making art before transferring to the California Institute of the Arts, where he won a Student Academy Award for his production "Next Door" and graduated in 1990.
Split into simpler sentences: He spent about a year at the University of Minnesota, in which he studied both philosophy and making art. Docter then transferred to the California Institute of the Arts. He won a Student Academy Award for his production "Next Door" and graduated in 1990.