Complex sentence: Christianity is the dominant religion in Badajoz and the see of the Dicoese of Badajoz is based here at the Badajoz Cathedral (Cathedral of St. John the Baptist), which dates to the 13th century.
Split into simpler sentences: Christianity is the dominant religion in Badajoz and the see of the Dicoese of Badajoz is based here at the Badajoz Cathedral. The Cathedral of St. John the Baptist, dates to the 13th century.