Complex sentence: The Great Western Railway was nationalised into the Western Region of British Railways on 1 January 1948 and the Bristol to Taunton Line is now part of Route 13 of the Network Rail system.
Split into simpler sentences: The Great Western Railway was nationalised on 1 January 1948 into the Western Region of British Railways. The Bristol to Taunton Line is now part of Route 13 of the Network Rail system.