sentences:  He was the Yankees manager for 12 years, as they won seven World Series, and came out of retirement to manage the expansion Mets when he was 72 years old.Appel served as Editor-at-Large for the National Baseball Hall of Fame and Museum's quarterly magazine, and helped write the text on the plaques of Hall of Fame inductees.He has contributed to publications including "Sports Collectors Digest", "Yankees Magazine", and "Encyclopedia Americana".