Complex sentence: Until 1900 the tramways on York Road were pulled by horses, however in 1900 they were elctrified, this improved transportation stimulated further growth around Harehills, Burmantofts and Osmondthorpe.
Split into simpler sentences: Until 1900 the tramways on York Road were pulled by horses, however in 1900 they were electrified. This improved transportation and stimulated further growth around Harehills, Burmantofts and Osmondthorpe.