Complex sentence: The 368 was standard equipment on all Lincolns in the 1956 and 1957 model years, and standard on the Mercury Turnpike Cruiser and Colony Park and optional on the Mercury Montclair, Monterey, Voyager, and Commuter.
Split into simpler sentences: The 368 was standard equipment on all Lincolns in the 1956 and 1957 model years. In its final year (1957), it also became standard equipment on the Mercury Turnpike Cruiser and Colony Park, and optional equipment on the Mercury Montclair, Monterey, Voyager, and Commuter.