Complex sentence: Great Western trains included long-distance express services such as the "Flying Dutchman", the "Cornish Riviera Express" and the "Cheltenham Spa Express", and suburban and rural services, many operated by steam railmotors or autotrains.
Split into simpler sentences: Great Western trains included long-distance express services such as the "Flying Dutchman", the "Cornish Riviera Express" and the "Cheltenham Spa Express". It also operated many and suburban and rural services, some operated by steam railmotors or autotrains.