Complex sentence: The 6.5x52mm Carcano was designed as a full-blown infantry cartridge, in accordance with the tactics of the time, the adjustable rear sight of the rifle allowing for volley fire up to 2,000 metres.
Split into simpler sentences: The 6.5x52mm Carcano was designed as a full-blown infantry cartridge. In accordance with the tactics of the time, the adjustable rear sight of the rifle allowing for volley fire up to 2,000 metres.