Complex sentence: Passenger numbers on the line were poor, so the line was more focussed on goods & when the majority of the Wirral Railway was electrified in 1938, the Seacombe branch was omitted.
Split into simpler sentences: Passenger numbers on the line were poor & the line was more focussed on goods. So when the majority of the Wirral Railway was electrified in 1938, the Seacombe branch was omitted.