Complex sentence: Sir Donald Campbell set the World water speed record on Ullswater on July 23rd 1955 he piloted the jet-propelled hydroplane "Bluebird K7" to a speed of 202.32 m.p.h.
Split into simpler sentences: Sir Donald Campbell set the World water speed record on Ullswater. On July 23rd 1955 he piloted the jet-propelled hydroplane "Bluebird K7" to a speed of 202.32 m.p.h.