Complex sentence: The Breda 30 is rather unique for light machine gun as it fires from a closed bolt alongside using blowback for its action and had a small lubricating device that sprayed oil on each cartridge as it entered the chamber.
Split into simpler sentences: The Breda 30 is rather unique for light machine gun as it fires from a closed bolt along with using blowback for its action. It also used a small lubricating device that oiled each cartridge as it entered the chamber.