Complex sentence: At this time Germany used a 220 V center tap giving 110 V from current pins to earth, which meant that fuse links were required in both sides of the appliance and double pole switches.
Split into simpler sentences: At this time, Germany used a 220 V center tapped supply, giving 110 V from each current pin to earth. This meant that fuse links were required in both sides of the supply and the use of double pole switches.