Complex sentence: Orlando Prina, official of the Alpini, served in the Greek campaign, then returned to Canzo after the armistice and worked clandestinely in the Resistance against German occupation, in spite of the presence in Canzo of two headquarters of SS corps.
Split into simpler sentences: Orlando Prina, official of the Alpini, served in the Greek campaign, then returned to Canzo after the armistice. He worked clandestinely in the Resistance against German occupation, in spite of the presence of two headquarters of SS corps.