Original sentence: In his books, Brown claims that, from the age of seven, he and his childhood friend Rick were trained in tracking and wilderness survival by Rick's grandfather, "Stalking Wolf" (whom Brown claims was Lipan Apache).There is no evidence that "Stalking Wolf" ever existed
Edited sentence: (However, the 2011 PhillyNews article states that Rick's death was from a horse-riding accident.A 493-word biography of Tom that appeared to be written by Jim, repeatedly mentioning Stalking Wolf as Tom's mentor (and Rick as Tom's friend), was contributed to this article's Talk Page (and still there as of 2021).Brief quotation of Tom's brother Jim which confirms that Stalking Wolf had mentored Tom is contained in a 2011 PhillyNews article on Tom and his work.In his books, Brown claims that, from the age of seven, he and his childhood friend Rick were trained in tracking and wilderness survival by Rick's grandfather, Stalking Wolf (who Brown claims was Lipan Apache)