Complex sentence: In 1872, now as Brother Rosario he began to do good service to make up for his time as a servant of Satan, he went to Pompeii where he had joined a charitable group and aided a wealthy widow Countess Mariana di Fusco.
Split into simpler sentences: In 1872, now as Brother Rosario, he began to do good service to make up for his time as a servant of Satan. He went to Pompeii, where he had joined a charitable group, and aided the wealthy widow Countess Mariana di Fusco.