Original: Reinforcements led by William Phillips (who served under Burgoyne at Saratoga) arrived in late March, and Phillips led further raids across Virginia, including a defeat of Baron von Steuben at Petersburg, until his death of fever on May 12, 1781.
Simplified: Reinforcements led by William Phillips (who served under Burgoyne at Saratoga) arrived in late March, and Phillips led further raids across Virginia, including a defeat of Baron von Steuben at Petersburg, until his death of fever on 12 May 1781.