Complex sentence: George H. Scholes Ltd. of Manchester first introduced plugs with a hollow round earth pin and rectangular current carrying pins in 1926 under the Wylex brand name, this was prior to the first British Standard for earthed plugs.
Split into simpler sentences: George H. Scholes Ltd. of Manchester first introduced plugs with a hollow round earth pin and rectangular current carrying pins in 1926 under the Wylex brand name. This was prior to the first British Standard for earthed plugs.