Complex sentence: Abuna Theophilos, also known as Abune Tewophilos, (1909-1977) was the second Patriarch of the Ethiopian Orthodox Tewahido Church, officially succeeding Abuna Basilios in 1971, after he had assumed the role of acting patriarch upon Abuna Basilios' death in 1970.
Split into simpler sentences: Abuna Theophilos, also known as Abune Tewophilos, (1909-1977) was the second Patriarch of the Ethiopian Orthodox Tewahido Church. He officially succeeded Abuna Basilios in 1971, having assumed the role of acting patriarch upon Abuna Basilios' death in 1970.