Complex sentence: His father, Ilarione Salvemini, was a "carabiniere" and part time teacher; a radical republican who had fought as a Red Shirt following Giuseppe Garibaldi in his fight for Italian unification.
Split into simpler sentences: His father, Ilarione Salvemini, was a "carabiniere" and part time teacher. He had been a radical republican who had fought as a Red Shirt following Giuseppe Garibaldi in his fight for Italian unification.