Complex sentence: Later the gun was fitted to Fiat L6/40 light tanks and the AB 41 armoured cars and in addition, it was employed as a deck-mounted anti-aircraft weapon in at least in some of the MAS torpedo boats.
Split into simpler sentences: Later the gun was fitted to Fiat L6/40 light tanks and the AB 41 armoured cars. In addition, this gun was employed as a deck-mounted anti-aircraft weapon in at least in some of the MAS torpedo boats.