Complex sentence: Despite their oaths and the threat of excommunication, the Crusaders systematically violated the city's holy sanctuaries, destroying or stealing all they could lay hands on; nothing was spared, not even the tombs of the emperors inside the St.Apostles church.
Split into simpler sentences: Despite their oaths and the threat of excommunication, the Crusaders systematically violated the city's holy sanctuaries, destroying or stealing all they could lay hands on; nothing was spared. Not even the tombs of the emperors inside the St.Apostles church.