Complex sentence: Outflanking the Sardinians, Bonaparte defeated them at Mondovi, and they signed an armistice at Cherasco, and then a peace at Paris on May 18, ceding Savoy and Nice and allowing the French bases for use against Austria.
Split into simpler sentences: Outflanking the Sardinians, Bonaparte defeated them at Mondovi, and they signed an armistice at Cherasco. On May 18 they signed a peace at Paris, ceding Savoy and Nice and allowing the French bases to be used against Austria.