Complex sentence: The Patron saint of the city is Saint Saturninus, Santu Sadurru in Sardinian language, which probably means that, in the Middle Ages, there was a confusion between Saturnus of Cagliari and Saturninus of Toulouse.
Split into simpler sentences: The Patron saint of the city is Saint Saturninus. The local name of Santu Sadurru could derive from a confusion between Saturnus of Cagliari and Saturninus of Toulouse.