Complex sentence: Since the Holy See officially approved the Fatima apparitions and the messages given to the three shepherd children, the place has become an important center of pilgrimage to which people from all over the world travel in a spirit of faith and penance.
Split into simpler sentences: Since the Holy See officially approved the Fatima apparitions and the messages given to the three shepherd children, the place has become an important center of pilgrimage. People from all over the world travel to it in a spirit of faith and penance.