Complex sentence: British Rail took over control of the Northern City Line from London Underground in 1975 and services from Finsbury Park to Moorgate were diverted from the Widened City Lines to the Northern City Line the following year.
Split into simpler sentences: British Rail took over control of the Northern City Line from London Underground in 1975. Services from Finsbury Park to Moorgate were diverted to the Northern City Line from the Widened City Lines the following year.