Complex sentence: Gerard Brandon was the son of Irish immigrant, Gerard Chittocque Brandon, who established and ran Selma Plantation in Adams County, Mississippi and Dorothy Nugent, the daughter of Irish immigrants Matthew Nugent and Isabel MacBray.
Split into simpler sentences: Gerard Brandon was the son of Irish immigrant, Gerard Chittocque Brandon, who established and ran Selma Plantation in Adams County, Mississippi. His wife, Dorothy Nugent, was the daughter of Irish immigrants, Matthew Nugent and Isabel MacBray.