Complex sentence: The Basilica di Sant'Andrea was erected by Cardinal Guala Bicchieri in 1219: together with the old Cistercian monastery, it is one of the most beautiful and best preserved Romanesque monuments in Italy.
Split into simpler sentences: The Basilica di Sant'Andrea was erected by Cardinal Guala Bicchieri in 1219. Together with the old Cistercian monastery, it is one of the most beautiful and best-preserved Romanesque monuments in Italy.