Complex sentence: The works undertakes the restoration and preservation of the railway's many heritage locomotives, carriages, wagons and features of all descriptions as well as the construction of new steam locomotives and passenger carriages, together with ongoing maintenance of the expanding fleets of railway vehicles.
Split into simpler sentences: The works undertakes the restoration and preservation of the railway's many heritage locomotives, carriages, wagons and features of all descriptions. It also builds new steam locomotives and passenger carriages, and undertakes the ongoing maintenance of the expanding fleet of railway vehicles.