Complex sentence: The gymnasium is decorated with several league and state championship banners and the names of all-state athletes, particularly in the sport of track and field, of which there are over 11 All-State and 9 State Championship banners.
Split into simpler sentences: The gymnasium is decorated with several league and state championship banners and the names of All-State athletes. Most recognized is the sport of track and field, for which there are over 11 All-State banners and nine state championship banners.