Complex sentence: It is customary in England to name each diocese after the city where its cathedral, is located; occasionally, when the bishop's seat has been moved from one city to another, the diocese may retain both names, for example Bath and Wells.
Split into simpler sentences: It is customary in England to name each diocese after the city where its cathedral, is located. Occasionally, when the bishop's seat has been moved from one city to another, the diocese may retain both names, for example Bath and Wells.