Complex sentence: George worked as an engine driver, both during and after his football career and, due to this background, he enlisted in the Railways Unit of the Australian Imperial Force (AIF) on 10 January 1917.
Split into simpler sentences: George worked as an engine driver, both during and after his football career. Due to this background, he enlisted in the Railways Unit of the Australian Imperial Force (AIF) on 10 January 1917.