Complex sentence: Johnstown was one of the last small cities to abandon trolley service as well as the smallest city in the United States to acquire a small fleet of PCC cars and trackless trolleys at a late date compared to larger transit properties.
Split into simpler sentences: Johnstown was one of the last small cities to abandon trolley service in the United States. It was also the smallest city to acquire a fleet of PCC cars and acquired trackless trolleys at a late date compared to larger transit properties.