Complex sentence: Later that year, Bonecrusher was the pre-post favourite against some of the world's best racehorses in the Japan Cup but contracted a virus in Tokyo, nearly lost his life, and had to withdraw from the race.
Split into simpler sentences: Later that year, Bonecrusher was the pre-post favourite against some of the world's best racehorses in the Japan Cup. He was struck down by a virus in Tokyo and nearly lost his life, and had to withdraw from the race.