Complex sentence: He graduated from St. John's School in 1987, which he later used as a prominent location throughout "Rushmore", and then graduated University of Texas at Austin in 1990, where he met frequent future collaborator Owen Wilson.
Split into simpler sentences: He graduated from St. John's School in 1987, which he later used as a prominent location throughout "Rushmore". Anderson graduated from the University of Texas at Austin in 1990, where he met frequent future collaborator Owen Wilson.