Complex sentence: He gained approval by the Continental Congress in 1779 to recruit a brigade of 3,000 slaves by promising them freedom in return for fighting, but was killed in the Battle of the Combahee River in August 1782.
Split into simpler sentences: He gained approval by the Continental Congress in 1779 to recruit a brigade of 3000 slaves by promising them freedom in return for fighting. He was killed in the Battle of the Combahee River in August 1782.