Complex sentence: David, a robber who terrorizes the whole region, undergoes a transformation caused by spiritual influence through his friendship with Antonio, an ex-priest, who had been captured by the Holy Inquisition back in his own country.
Split into simpler sentences: David, a robber who terrorizes the whole region, undergoes a transformation caused by spiritual influence. Another foreigner, Antonio, an ex-priest, who had been captured by the Holy Inquisition back in his own country.