Complex sentence: His father, John Thomas, of Welsh descent, and his mother, Elizabeth Rochelle Thomas, a descendant of French Huguenot immigrants, had nine children, George a middle child and the youngest of the three boys.
Split into simpler sentences: His father, John Thomas, of Welsh descent, and his mother, Elizabeth Rochelle Thomas, a descendant of French Huguenot immigrants, had nine children. George was a middle child and the youngest of the three boys.