Complex sentence: The prank was played at the height of UFO hysteria in the United States, as a result the Atlanta Police received constant phonecalls after news of the story broke, with multiple residents adamant they had seen the flying saucer that the pranksters described.
Split into simpler sentences: The prank was played at the height of UFO hysteria in the United States. As a result, the Atlanta Police received constant phone calls after news of the story broke, with multiple residents adamant they had seen the flying saucer that the pranksters described.