Complex sentence: The second family who owned and occupied the house, for another four generations, was the Derby family, starting with John Derby, grandson of Elias Hasket Derby, of Salem, Massachusetts, America's first millionaire.
Split into simpler sentences: The second family who owned and occupied the house, for another four generations, was the Derby family. Starting with John Derby, grandson of Elias Hasket Derby, of Salem, Massachusetts, America's first millionaire.