Complex sentence: He married Sophia Crofton, daughter of Sir Marcus Lowther Crofton of Mote, County Roscommon, first of the Crofton Baronets, and his wife Catherine Crofton, and they had two children, a son Peter who died at 17, and a daughter who died young.
Split into simpler sentences: He married Sophia Crofton, daughter of Sir Marcus Lowther Crofton of Mote, County Roscommon, first of the Crofton Baronets, and his wife Catherine Crofton. They had two children, a son Peter who died at 17, and a daughter who died young.