Complex sentence: And it will use up to 50 per cent less energy than the Class 319s, which currently operate on the Thameslink services, partly due to the weight saving and regenerative braking now standard on commuter trains.
Split into simpler sentences: And it will use up to 50 per cent less energy than the Class 319s, which currently operate on the Thameslink services. That's partly due to the weight saving, and to the regenerative braking now standard on commuter trains.