Complex sentence: McLean was the last casualty of the Chilcotin War of 1864 and the father of outlaw and renegade Allan McLean, leader of the "Wild McLean Boys" gang.
Split into simpler sentences: McLean was the last casualty of the Chilcotin War of 1864. He was the father of outlaw and renegade Allan McLean, leader of the "Wild McLean Boys" gang.