Complex sentence: Owned by the federal government and operated by the National Park Service, the historic district encompasses properties in the states of New York and New Jerseyand was mostly constructed during the late 19th and early 20th century.
Split into simpler sentences: Owned by the federal government and operated by the National Park Service, the historic district encompasses properties in the states of New York and New Jersey. The historic district was mostly constructed during the late 19th and early 20th century.