Original sentence: As of 2018 he was enrolled at Stanford University as a junior majoring in anthropology and in electrical engineering.His work has been questioned by some scientists and writers because it has not been published in a peer-reviewed scientific journal.Jack Thomas Andraka (born January 8, 1997) is an American university student, inventor, and cancer researcher.While still a high school student he came to national attention after winning the grand prize at the 2012 Intel International Science and Engineering Fair where he presented a method for possibly detecting the early stages of pancreatic and other cancers
Edited sentence: He is known for his award-winning work on a potential method for possibly detecting the early stages of pancreatic and other cancers, which he performed while he was a high school student.Jack Thomas Andraka (born January 8, 1997) is an American inventor, scientist, and cancer researcher.Since 2015, he has attended Stanford University as an undergraduate.The validity of his research has since been questioned by other scientists