Complex sentence: Lacedonia has been the seat of a bishopric since the 11th century, but the present church was built at the end of the 17th century, after an earthquake had almost completely destroyed the town.
Split into simpler sentences: Lacedonia has been the seat of a bishopric since the 11th century. The present church however was built at the end of the 17th century, after an earthquake had almost completely destroyed the town.