Complex sentence: It is dedicated to the Nativity of the Virgin Mary, and was most probably built by the architect Vittorio Cassar in 1580 as a monument to the Christian Victory after the Great Siege of 1565.
Split into simpler sentences: It is dedicated to the Nativity of the Virgin Mary. It was most probably built by the architect Vittorio Cassar in 1580 as a monument to the Christian Victory after the Great Siege of 1565.