Complex sentence: The incident (similar to the more famous Roswell UFO incident 50 years later) is claimed to have resulted in a fatality from the crash and the alleged alien body is to have been buried in an unmarked grave at the local cemetery.
Split into simpler sentences: The incident (similar to the more famous Roswell UFO incident 50 years later) reportedly resulted in a fatality from the crash. The alleged alien body is reportedly buried in an unmarked grave at the local cemetery.