Complex sentence: The site was chosen in 1518, the façade by dal Volterra erected 1582-1593, the altar was consecrated in 1594, roof finished in 1598, but the apse competed only in 1675, when a new main altar was consecrated.
Split into simpler sentences: The site was chosen in 1518, the façade by da Volterra being erected 1582-1593, the altar consecrated in 1594, and the roof finished in 1598. The apse was completed only in 1675, when a new main altar was consecrated.