Complex sentence: Before Sprug's goons can finish off Bardo, Bardo uses a magnetic-like force to retrieve his gun and proceeds to blast Cally and Fisher into bloody chunks, which is not capable of doing this to humans, but can still do significent damage on Earth.
Split into simpler sentences: Before Sprug's goons can finish off Bardo, Bardo uses a magnetic-like force to retrieve his gun and proceeds to blast Cally and Fisher into bloody chunks. While Bardo's handgun is not capable of doing this to humans, its bullets can still do significent damage on Earth.