Complex sentence: The following year he was victorious the Irish 2,000 Guineas with Signal Box In addition he rode Signal Box in the 1951 Epsom Derby when the horse finished third to Arctic Prince.
Split into simpler sentences: The following year he was victorious the Irish 2,000 Guineas with Signal Box. He rode Signal Box in the 1951 Epsom Derby where the horse finished third to Arctic Prince.