Complex sentence: St. Spyridon is the Greek Orthodox precense in the area of South East Sydney, it functions through the authority of the Greek Orthodox Archdiochises of Australia, which derives its duristiction from the Ecumenical Patriarch of Constantinople.
Split into simpler sentences: St. Spyridon is the Greek Orthodox precense in the area of South East Sydney. It functions through the authority of the Greek Orthodox Archdiocese of Australia, which derives its jurisdiction from the Ecumenical Patriarch of Constantinople.