Complex sentence: Cyborg opens the door and sees a weakened Kal-El. With the arrival of guards, they're forced to escape, Kal-El's powers begin to manifest and he flies off, leaving them at the hands of the guards.
Split into simpler sentences: Cyborg opens the door and sees a weakened Kal-El, with the arrival of guards. Forced to escape, Kal-El's powers begin to manifest and he flies off, leaving them at the hands of the guards.