Complex sentence: They saw a inmate held up in front of a window, he was being tortured by using a blow torch on his face, they then started using the torch on his eyes, and then the inmate's head exploded.
Split into simpler sentences: They saw an inmate held up in front of a window; he was being tortured by using a blow torch on his face. They then started using the torch on his eyes, and then the inmate's head exploded.