Complex sentence: First Great Western is the operating name of First Greater Western Ltd, a British train operating company owned by FirstGroup that serves Greater London, the South East, South West and West Midlands regions of England, as well as South Wales.
Split into simpler sentences: First Great Western is the operating name of First Greater Western Ltd, a British train operating company owned by FirstGroup. It serves Greater London, the South East, South West and West Midlands regions of England, and South Wales.