Complex sentence: Sally St. Clair of South Carolina, a woman of African and French ancestry, passed as a man and served as a gunner in the Continental army; her gender was not revealed until after she was killed in action in the Battle of Savannah.
Split into simpler sentences: Sally St. Clair of South Carolina, a woman of African and French ancestry, passed as a man and served as a gunner in the Continental army. Her gender was not revealed until she was killed in action in the Battle of Savannah.