Complex sentence: The modern version of "calcio" has not changed much from its historical roots which allows tactics such as head-butting, punching, elbowing, and choking, however due to often fatal injuries, sucker punches and kicks to the head are currently banned.
Split into simpler sentences: The modern version of "calcio" has not changed much from its historical roots, which allow tactics such as head-butting, punching, elbowing, and choking. However due to often fatal injuries, sucker punches and kicks to the head are currently banned.