Original sentence: After the revived interest in the 1970s surrounding the balloon crash that is often referred to as the "1947 Roswell UFO incident", “Area 51” was rumored by ufologists and conspiracy theorists to be the US government's storage location for the crashed alien craft for study
Edited sentence: After the Roswell UFO incident in New Mexico 1947 “Area 51” was long rumored to be the store location for the crashed alien craft for study