Complex sentence: The London and North Eastern Railway had inherited the North Eastern Railway Tyneside Electrics 3rd rail DC system and in 1938 the system was to extended to South Shields and the LNER electric units bought to replace units destroyed by fire and allow for service expansion.
Split into simpler sentences: The London and North Eastern Railway inherited the North Eastern Railway Tyneside Electrics third rail DC system. In 1938 the system to extended to South Shields and the LNER electric units were bought to replace units destroyed by fire and allow for service expansion.