Complex sentence: Most major US university and high school music programs boasted large clarinet choirs, notable examples were the choirs at the University of Illinois, Iowa State University, Fresno State College, Montana State University, Duquesne University, and Lebanon Valley College.
Split into simpler sentences: Most major US university and high school music programs boasted large clarinet choirs. Notable examples were the choirs at the University of Illinois, Iowa State University, Fresno State College, Montana State University, Duquesne University, and Lebanon Valley College.