Complex sentence: Fort Dumpling, dating from the Revolutionary War, used to occupy a small site within Fort Wetherill, all of which was turned over to the State of Rhode Island after World War II and is now operated as Fort Wetherill State Park, a reservation.
Split into simpler sentences: Fort Dumpling, dating from the Revolutionary War, used to occupy a small site within Fort Wetherill. The fort was deactivated and turned over to the State of Rhode Island after World War II and is now operated as Fort Wetherill State Park, a reservation.