Complex sentence: An inconclusive and unfinished trial took place, and Caterina remained imprisoned until 30 June 1501, when she was released by Yves d'Allègre, who had come to Rome with the army of Louis XII for the conquest of the Kingdom of Naples.
Split into simpler sentences: An inconclusive and unfinished trial took place, and Caterina remained imprisoned until 30 June 1501. At that time she was released by Yves d'Allègre, who had come to Rome with the army of Louis XII for the conquest of the Kingdom of Naples.