Complex sentence: The London, Midland and Scottish Railway Fowler Class 7F steam locomotive was an update of the London and North Western Railway (LNWR) G2 Class 0-8-0.
Split into simpler sentences: The London, Midland and Scottish Railway Fowler Class 7F was a class of 0-8-0 steam locomotives. They were a Midlandised version of the London and North Western Railway (LNWR) G2 Class 0-8-0.