Complex sentence: The Planting Fields Arboretum over 400 acres is an arboretum and state park located between Oyster Bay and Locust Valley on New York, USA's Long Island.
Split into simpler sentences: The Planting Fields Arboretum is an arboretum and state park covering over 400 acres. The Arboretum lies between Oyster Bay and Locust Valley on New York, USA's Long Island.