Complex sentence: Unlike the Class 150 units, the 156s have a single leaf sliding door at either end of each coach-this feature reflected the anticipated longer journeys with fewer stops that the Class 156 was supposed to operate.
Split into simpler sentences: Unlike the Class 150 units, the 156s have a single-leaf sliding door at either end of each coach. This reflected the expected longer journeys with fewer stops that the Class 156 was supposed to operate.