Complex sentence: He was also thought to have shot and killed French Foreign Minister Louis Barthou until 1974, when it was revealed that the bullet actually came from a French policeman reacting to the shooting of King Alexander.
Split into simpler sentences: He was also thought to have shot and killed French Foreign Minister Louis Barthou. However, in 1974, it was revealed that the bullet actually came from a French policeman reacting to the shooting of King Alexander.