Complex sentence: The three continued to operate peacefully together, but by the early 1950s Moretti became mentally ill. It was then decide that Moretti would be killed, while having lunch hitman shot him to death on October 4,1951.
Split into simpler sentences: The three continued to operate peacefully together, but by the early 1950s Moretti became mentally ill. It was then decided that Moretti would be killed. While having lunch a hitman shot him to death on October 4,1951.