Complex sentence: The Meadowbrook State Parkway was part of the original design for the Long Island Parkway System, developed by Robert Moses and the Long Island State Park Commission (LISPC) in 1924 to alleviate congestion on "unattractive" local roads.
Split into simpler sentences: The Meadowbrook State Parkway comes from a part of the original design for the Long Island Parkway System, developed by Robert Moses and the Long Island State Park Commission (LISPC), created in 1924. Moses wanted a parkway system to alleviate congestion on "unattractive" local roads.