Complex sentence: Between 1998 and 2000, Stay Gold ran prominently in many of Japan's top races, including the Diamond Stakes, Tenno Sho (Spring), Takarazuka Kinen, Arima Kinen, and Tenno Sho (Autumn).
Split into simpler sentences: Between 1998 and 2000, Stay Gold ran prominently in many of Japan's top races. He reached the frame in the Diamond Stakes, Tenno Sho (Spring), Takarazuka Kinen, Arima Kinen and Tenno Sho (Autumn).