Complex sentence: With the exception of the high-season Port Erin-Douglas boat train, all operated between 9.30am and 5.30pm, quite a contrast to the 15-hours-a-day operation of the 1920s and 1930s.
Split into simpler sentences: With the exception of the high-season Port Erin-Douglas boat train, all workings operated between 9.30am and 5.30pm. This represents quite a contrast to the 15-hours-a-day operation of the 1920s and 1930s.