Complex sentence: American Football, is a sport played in a league known as the National Football League and is an example of a sporting franchise in which there have been several instances on domestic violence, most often resulting in some sort of violence against women.
Split into simpler sentences: American Football, is a sport played professionally in a league known as the National Football League. The NFL example of a sporting franchise in which there have been several instances on domestic violence, most often resulting in some sort of violence against women.