Complex sentence: Rome, the capital of the Roman Empire till 330, was the most important Christian center in the West, and would come to claim primacy over all of Christendom, see Historical development of the doctrine of Papal Primacy for details.
Split into simpler sentences: Rome, the capital of the Roman Empire till 330, was the most important Christian center in the West, and would come to claim primacy over all of Christendom. See Historical development of the doctrine of Papal Primacy for details.