Complex sentence: Manasquan High School competes in the Shore Conference, an athletic conference made up of private and public high schools centered at the Northern Jersey Shore in Monmouth County and Ocean County and operating under the jurisdiction of the New Jersey State Interscholastic Athletic Association (NJSIAA).
Split into simpler sentences: Manasquan High School competes in the Shore Conference, an athletic conference made up of private and public high schools centered at the Northern Jersey Shore. The league operates under the jurisdiction of the New Jersey State Interscholastic Athletic Association (NJSIAA).