Complex sentence: It runs northeast through the city of Castel San Pietro Terme, Province of Bologna in Emilia Romagna and forms the border between the province of Ferrara and the province of Ravenna for a short distance before entering the province of Ferrara.
Split into simpler sentences: It runs northeast through the city of Castel San Pietro Terme, Province of Bologna in Emilia Romagna. It then forms the border between the province of Ferrara and the province of Ravenna for a short distance before entering the province of Ferrara.