Complex sentence: Incorporated to finalize the shot is a lock-on system, as a quarry is decided upon, the designator will zoom a triangle in on the prey from the HUD, which will flash and turn solid red, then fires.
Split into simpler sentences: Incorporated to finalize the shot is a lock-on system. As the quarry is decided upon, the designator will zoom a triangle in on the prey from the HUD, which will flash and turn solid red, then fires.