Complex sentence: In 1963, Allibone left Aldermaston to become the Central Electricity Generating Boards chief scientist, a post he held until 1970, he also became External Professor of Electrical Engineering at Leeds University in 1967.
Split into simpler sentences: In 1963, Allibone left Aldermaston Court to become the Central Electricity Generating Board's chief scientist, a post he held until 1970. He also became External Professor of Electrical Engineering at Leeds University in 1967.