Complex sentence: Known to Caproni at the time as the Caproni 450 hp, the Italian Army designated it the Ca.3, and in Caproni's post-war redesignation, it became the Ca.33.
Split into simpler sentences: Known to Caproni at the time as the Caproni 450 hp, the Italian Army designated it the Ca.3. In Caproni's post-war redesignation, it became the Ca.33.