Complex sentence: When the First World War broke out in August 1914, Morshead resigned his teaching position and his commission in the Cadet Corps to travel to Sydney and enlist as a private in the 2nd Infantry Battalion of the First Australian Imperial Force.
Split into simpler sentences: When the First World War broke out in August 1914, Morshead was working as a teacher. He resigned his teaching position and his commission in the Cadet Corps, and travelled to Sydney to enlist as a private in the 2nd Infantry Battalion of the First Australian Imperial Force.