Complex sentence: He was adopted by James Keays (Sr.) and Jessie Cameron ("née " Caldwell) Keays, a childless couple from Clydebank, they migrated to Australia on"RMS Asturias" leaving Southampton on 5 September 1951, four days before he turned five.
Split into simpler sentences: He was adopted by James Keays (Sr.) and Jessie Cameron ("née " Caldwell) Keays, a childless couple from Clydebank. They migrated to Australia on"RMS Asturias", leaving Southampton on 5 September 1951, four days before he turned five.