Complex sentence: After WWII he received his MBA from Stanford in 1946, and then in the late 1950s he lived in Hawaii and worked as an executive for Castle & Cooke and Dole Pineapple companies.
Split into simpler sentences: After WWII he received his MBA from Stanford in 1946. Then in the late 1950s he lived in Hawaii, working as an executive for Castle & Cooke and Dole Pineapple companies.