Complex sentence: As chairman of the music department at the University of Wyoming, he is credited with rapidly expanding music arts within the institution--and he made the department more comprehensive and deeper for aspiring academicians and professionals in performance, composition, education, and musicology.
Split into simpler sentences: As chairman of the music department at the University of Wyoming, he is credited with rapidly expanding music arts within the institution. He spearheaded developing a more comprehensive and deeper Music Department for aspiring academicians and professionals in performance, composition, education, and musicology.