Complex sentence: De Gaulle was born in the industrial region of Lille in French Flanders, the third of five children of Henri de Gaulle, a professor of history and literature at a Jesuit college, who eventually founded his own school.
Split into simpler sentences: De Gaulle was born in the industrial region of Lille in French Flanders, the third of five children. His father, Henri de Gaulle, was a professor of history and literature at a Jesuit college who eventually founded his own school.