Complex sentence: Passenger numbers on the line were poor and the line was more focused on goods, so 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.