Complex sentence: Captain Mark Rudkin was a member of the British Army stationed at St. John's, Newfoundland, Canada and the last person to duel in Newfoundland, and caused the loss of life to Ensign John Philpot of the Royal Veteran Companies also stationed at St. John's.
Split into simpler sentences: Captain Mark Rudkin was a member of the British Army stationed at St. John's, Newfoundland. He was the last person to duel in Newfoundland, and caused the loss of life to Ensign John Philpot of the Royal Veteran Companies also stationed at St. John's.