Complex sentence: Somerville High School competes in the Skyland Conference, which is made up of public and parochial high schools covering Hunterdon County, Somerset County and Warren County in west central New Jersey, operating under the jurisdiction of the New Jersey State Interscholastic Athletic Association (NJSIAA).
Split into simpler sentences: Somerville High School competes in the Skyland Conference, which is made up of public and parochial high schools covering Hunterdon County, Somerset County and Warren County in west central New Jersey. The conference operates under the jurisdiction of the New Jersey State Interscholastic Athletic Association (NJSIAA).