Complex sentence: When he was 15 years old, Seraphine dropped out of Steinmetz High School, Seraphine studied privately with famed percussionist Bob Tilles at DePaul University, where members of Chicago were also studying.
Split into simpler sentences: When he was 15 years old, Seraphine dropped out of Steinmetz High School. He studied privately with famed percussionist Bob Tilles at DePaul University, where members of Chicago were also studying.