Complex sentence: The other two cars were red Picton-Greymouth cars that were refitted and repainted to the same standard but retained their smaller windows and seated 50, same seating arrangement and type as the servery car.
Split into simpler sentences: The other two cars were red Picton-Greymouth cars that were similarly refitted and repainted. These cars retained their smaller windows and seated 50, same seating arrangement and type as the servery car.