Complex sentence: He served as honorary colonel of the Royal Australian Regiment and the Royal Western Australia Regiment from 1960 until 1965, when he was appointed Chairman of the Western Australian Coastal Shipping Commission, a position he held until 1970.
Split into simpler sentences: He served as honorary colonel of the Royal Australian Regiment and the Royal Western Australia Regiment from 1960 until 1965. That year, he was appointed Chairman of the Western Australian Coastal Shipping Commission, a position he held until 1970.