Complex sentence: As Boniface VIII favored the first, he and Jacopone could never see eye to eye and the pope excommunicated and imprisoned him, but for all the punishments he received he was even more steadfast in condemning corruption and went as far as insulting the pontiff.
Split into simpler sentences: As Boniface VIII favored the first, he and Jacopone could never see eye to eye and the Pope excommunicated and imprisoned him. For all the punishments Jacopone received, he was all the more steadfast in condemning corruption and went so far as to insult the pontiff.