Complex sentence: Hyman was originally committed to play for Princeton during the 2010--11 season, however, he decommitted after Princeton head coach Guy Gadowsky left the school to start the Division I hockey program at Penn State.
Split into simpler sentences: Hyman was originally committed to play for Princeton during the 2010--11 season. However, he decommitted after Princeton head coach Guy Gadowsky left the school to start the Division I hockey program at Penn State.