Complex sentence: He attended the State University of New York at Plattsburgh, and spent his junior year as an exchange student at The College of William and Mary where he was friends with future comic and political commentator Jon Stewart.
Split into simpler sentences: He attended the State University of New York at Plattsburgh. He spent his junior year as an exchange student at The College of William and Mary, where he was friends with future comic/political commentator Jon Stewart.