Complex sentence: Buscaino's proposal would involve keeping the large wrought iron fence up, however, the proposal would require the park officials of the area to install a gateway in the fence that would mechanically close and bar off the area at sunset.
Split into simpler sentences: Buscaino's proposal would involve keeping the large wrought iron fence. However, the proposal would require the park officials to install a gate in the fence that would mechanically close and bar off the area at sunset.