Complex sentence: The Cathedral of the Good Shepherd located in the city of San Sebastián, Gipuzkoa, Basque Country, Spain, is the seat of the suffragan Diocese of San Sebastián, subordinated to the Archdiocese of Pamplona y Tudela.
Split into simpler sentences: The Cathedral of the Good Shepherd located in the city of San Sebastián, Gipuzkoa, Basque Country, Spain. It is the seat of the suffragan Diocese of San Sebastián and subordinated to the Archdiocese of Pamplona y Tudela.