Complex sentence: To prevent the island from becoming polluted, the only motorized vehicles permitted on the island are service vehicles (ambulance, fire, police, and the like) the only forms of transport are by foot, horse and buggy and service transport.
Split into simpler sentences: To prevent the island from becoming polluted, the only motorized vehicles permitted on the island are service vehicles such as ambulances, fire trucks, police cars, and the like. The only forms of transport are by foot, horse and buggy and service transport.