Complex sentence: Aboard the helicopters the 6 RAR Regimental Sergeant Major, Warrant Officer George Chinn, and the officer commanding Administration Company, Major Owen O'Brien, pushed the crates out to the soldiers waiting below, many of whom were now very low on ammunition.
Split into simpler sentences: Aboard the helicopters was the 6 RAR Regimental Sergeant Major, Warrant Officer George Chinn, and the officer commanding Administration Company, Major Owen O'Brien. Chinn and O'Brien pushed the crates out to the soldiers waiting below, many of whom were now very low on ammunition.