Jonathan Sheppard, a Hall of Fame trainer whose horses excelled on the dirt, on turf and over steeplechase fences, will retire from American horse racing, but will continue to train a small stable in Ireland, he announced Monday morning. Sheppard, who turned 80 last month, won every race and prize worth winning in American steeplechase racing over a 56-year career. He is the National Steeplechase Association's all-time leading trainer by wins (1,242) and purse earnings ($24,902,442). He has been the champion trainer by wins 26 times, and he has led...