Complex sentence: His son Garrett Voorhees II, became the owner and served in Washington's Continental Army, the original homestead was burned by Cornwallis at the time of his critical and embarrassing retirement from the Somerset Courthouse in Millstone, New Jersey on June 19,1777.
Split into simpler sentences: His son Garrett Voorhees II, became the owner and he later served in the Continental Army. The original homestead was burned by General Cornwallis during his retreat from the Somerset County Courthouse in Millstone, New Jersey on June 19,1777.