Complex sentence: The Australian EF88 version of the AUG was tested with a new grenade launcher specifically designed for it called the ML40AUS GLA (Grenade Launcher Assembly), one of the lightest underbarrel grenade launchers at less than due to steel, aluminium, and synthetic parts.
Split into simpler sentences: The Australian EF88 version of the AUG had been tested with a new grenade launcher specifically designed for it called the ML40AUS GLA (Grenade Launcher Assembly). The ML40AUS is one of the lightest underbarrel grenade launchers at less than due to steel, aluminium, and synthetic parts.