Complex sentence: In 1916, during the First Portuguese Republic, the Church of Santa Engrácia was turned into a National Pantheon, although it was completed only in 1966, during the government of the Dictator António de Oliveira Salazar.
Split into simpler sentences: In 1916, during the First Portuguese Republic, the Church of Santa Engrácia was converted into a National Pantheon. It was completed only in 1966, during the government of the Dictator António de Oliveira Salazar.