Complex sentence: Its construction, which uses an above-deck truss, contrasts with the below-deck truss of the eastern viaduct, which was completed in 1910 and formed part of the Great Central Railway.
Split into simpler sentences: Its construction, which uses an above-deck truss, contrasts with the eastern viaduct, which uses a below-deck truss. This was completed in 1910 and formed part of the Great Central Railway.