Complex sentence: However in 1936 the LNER wholly took ownership of the M&GN system, and closed the works as the LNER had major works at Doncaster and Stratford which contained more modern machines and skills, so the amount of work the plant did was vastly decreased.
Split into simpler sentences: However in 1936 the LNER wholly took ownership of the M&GN system.The LNER had major works at Doncaster and Stratford. These contained more modern machines and skills, so the amount of work the plant did was vastly decreased.