Complex sentence: Gradually, they push the Ming warriors back but take many losses, killing a few of them before Itadori challenges Rarou to a duel, but ends in Itadori's death by a gunshot from Byakuran.
Split into simpler sentences: Gradually, they push the Ming warriors back but take many losses, killing a few of them before Itadori challenges Rarou to a duel. It ends in Itadori's death by a gunshot from Byakuran.