Complex sentence: He joined the Australian Army as a regular soldier in 1906, and served at Gallipoli, where he led a daring raid behind enemy lines, and on the Western Front as chief of staff of the Australian Corps under Lieutenant General Sir John Monash.
Split into simpler sentences: He joined the Australian Army as a regular soldier in 1906, and served at Gallipoli, where he led a daring raid behind enemy lines. He later served on the Western Front as chief of staff of the Australian Corps under Lieutenant General Sir John Monash.