Complex sentence: Since the early 1990's Billy Hart has ends considerable time at the Oberlin Conservatory of Music, but he is also adjunct faculty at the New England Conservatory of Music and Western Michigan University.
Split into simpler sentences: Since the early 1990's Billy Hart has devoted a lot of time to teaching. He spends considerable time at the Oberlin Conservatory of Music, but he is also adjunct faculty at the New England Conservatory of Music and Western Michigan University.