Complex sentence: Until 1959, the Orthodox Tewahedo churches were administratively part of the Coptic Church.The Ethiopian Orthodox Tewahedo Church was granted autocephaly and its own Patriarch that year by Coptic Orthodox Pope Pope Cyril VI of Alexandria.
Split into simpler sentences: Until 1959, the Orthodox Tewahedo churches were administratively part of the Coptic Church. That year, the Ethiopian Orthodox Tewahedo Church was granted autocephaly and its own Patriarch by Coptic Orthodox Pope Pope Cyril VI of Alexandria.