Complex sentence: Christened'The Yorkshire Horse', Daglish's locomotive successfully replaced the use of horses on the tramway whilst George Stephenson was still developing "Blucher" at Killingworth colliery.
Split into simpler sentences: Christened'The Yorkshire Horse', Daglish's locomotive successfully replaced the use of horses on the tramway. At this time George Stephenson was still developing "Blucher" at Killingworth colliery.