Complex sentence: The park derives its name from Smith Point which is a peninsula on the Long Island mainland sticking into Bellport Bay which in turn was named for William "Tangier" Smith who in the 1600s owned of ocean front property in the Manor of St. George.
Split into simpler sentences: The park derives its name from Smith Point, a peninsula on the Long Island mainland that extends into Bellport Bay. The peninsula was named for William "Tangier" Smith, who in the 1600s owned of ocean-front property in the Manor of St. George.