Complex sentence: He made his debut in the Poule d'Essai des Poulains over 1600 metres at Longchamp on 25 April when he started favourite against eight opponents but finished fourth behind Melyno, Tampero and Day Is Done.
Split into simpler sentences: He made his debut in the Poule d'Essai des Poulains over 1600 metres at Longchamp on 25 April. He started favourite against eight opponents but finished fourth behind Melyno, Tampero and Day Is Done.