Complex sentence: He went south to the Siege of Charleston with reinforcements; after the city fell to the British, Lord Cornwallis posted him at Camden (16 August 1780) as the British sought to occupy South Carolina.
Split into simpler sentences: He went south to the Siege of Charleston with reinforcements. After the city fell to the British, Lord Cornwallis posted him at Camden (16 August 1780) as the British sought to occupy South Carolina.