Complex sentence: Plans to construct a separate pedestrian bridge to provide Manhattan residents better access to the new Wards Island's Park were developed by Robert Moses in 1937, but construction of the Wards Island Bridge also known as the 103rd Street Footbridge, did not begin until 1949.
Split into simpler sentences: Plans to construct a separate pedestrian bridge, to provide Manhattan residents better access to the new Wards Island's Park, were developed by Robert Moses in 1937. However, construction of the Wards Island Bridge, also known as the 103rd Street Footbridge, did not begin until 1949.