Complex sentence: Byzantine music is not only music of the Byzantine empire, because did not dissappear after the fall of Constantinople, it was continued under the Patriarchate which became the part of the Ottoman administration responsible for the Orthodox Christians of the empire.
Split into simpler sentences: Byzantine music is not only the music of the Byzantine empire, because did not dissappear after the fall of Constantinople. It was continued under the Patriarchate which became the part of the Ottoman administration responsible for the Orthodox Christians of the empire.