RETIRED. Angel Cordero Jr., 49, colorful, hard-riding Thoroughbred jockey; in New York City. Seriously injured in a four-horse spill at Aqueduct last January, he will turn to training horses. In a 31-year career, Cordero won 7,076 races (third to Bill Shoemaker and Laffit Pincay Jr.), two Eclipse Awards as best jockey and a record 14 riding titles at Saratoga. His mounts earned $164,571,847, second on the all-time list. Elected to the National Museum of Racing's Hall of Fame in 1988, Cordero won three Kentucky Derbies, on Cannonade (1974), Bold Forbes (1976) and Spend a Buck (1985), two Preaknesses, on Codex (1980) and Gate Dancer (1984), and one Belmont Stakes, on Bold Forbes (1976).