Complex sentence: Jim Nill played one season for the Drumheller Falcons of the AJHL in 1975, after which he played three seasons with the Medicine Hat Tigers of the WCHL.
Split into simpler sentences: Jim Nill played 1 season for the Drumheller Falcons of the AJHL in 1975. The next 3 years were spent with the Medicine Hat Tigers of the WCHL.