The sweeping curves of the colonnades reach out to the unending stream of pilgrims from Rome itself and the whole world, urbi et orbi, to take them into the bosom of the church beyond.
The pilgrims are glad that the sweeping curves of the colonnade are welcoming them.
mnli hypothesis: The pilgrims are glad that the sweeping curves of the colonnade are welcoming them. premise: The sweeping curves of the colonnades reach out to the unending stream of pilgrims from Rome itself and the whole world, urbi et orbi, to take them into the bosom of the church beyond.