Complex sentence: The tank is equipped with laser warning receivers, which are able to pick up reflected laser radiation, so even if the tank is not illuminated but there are LRF/LD in the area, the crew will be warned.
Split into simpler sentences: The tank is equipped with laser warning receivers, which are able to pick up reflected laser radiation. So even if the tank is not illuminated but there are LRF/LD in the area, the crew will be warned.