Complex sentence: After his political career in 1997, he served as director of the future Paul Simon Public Policy Institute at Southern Illinois University Carbondale in Carbondale, Illinois, which was renamed in his honor; there, he taught classes on politics, history and journalism.
Split into simpler sentences: After his political career in 1997, he served as director of the future Paul Simon Public Policy Institute at Southern Illinois University Carbondale in Carbondale, Illinois, which was renamed in his honor. There, he taught classes on politics, history and journalism.