Complex sentence: O'Neill's father, Brian O'Neill, was an Australian-born magistrate of Irish descent and his mother, Awambo Yari, was a Papua New Guinean from the Southern Highlands.
Split into simpler sentences: O'Neill's father, Brian O'Neill, was an Australian-born magistrate of Irish descent. His mother, Awambo Yari, a Papua New Guinean, came from the Southern Highlands.