Complex sentence: It was clear, however, that Moontjeu had run far below his best, his trainer, John Hammond observing that "You always think there's going to come a day when they don't quite fire and that happened today".
Split into simpler sentences: It was clear, however, that Montjeu had run far below his best. His trainer, John Hammond observed that "You always think there's going to come a day when they don't quite fire and that happened today".