Complex sentence: Among the square's landmarks are the Sukiennice--originally designed in the 14th century as a center for cloth trade, it was gutted by fire in 1555 and rebuilt in the Renaissance style by Giovani il Mosca from Padua.
Split into simpler sentences: Among the square's landmarks is the cloth hall, which was originally designed in the 14th century as a center for cloth trade. It was gutted by fire in 1555 and rebuilt in the Renaissance style by Giovani il Mosca from Padua.