Complex sentence: In 1870 the "Catholicon" of the Monastery that is dedicated to the Transfiguration and to the holy founder Venerable David, was destroyed by an earthquake and it was rebuilt in 1877 by Anthimos Aggelis who was Abbot at that time.
Split into simpler sentences: In 1870 the "Catholicon" of the Monastery that is dedicated to the Transfiguration and to the holy founder Venerable David, was destroyed by an earthquake. It was rebuilt in 1877 by Anthimos Aggelis who was Abbot at that time.