Complex sentence: During the 20th century the building was used as a school by the religious institute of the Salesians of Don Bosco, who in 1936 added a chapel to the south of the house, dedicating it to Saint John Bosco.
Split into simpler sentences: During the 20th century the building was used as a school by the order of Salesians of Don Bosco. In 1936 the order added a chapel to the south of the house, dedicating it to Saint John Bosco.