Complex sentence: For his part, Darkseid is more lenient towards Kalibak's failures than those of his other servants-having slain him, he always returns him to life; it is implied this is because his eldest son is the offspring of the one person Darkseid truly loved.
Split into simpler sentences: For his part, Darkseid is more lenient towards Kalibak's failures than those of his other servants; having slain him, he always returns him to life. It is implied this is because his eldest son is the offspring of the one person Darkseid truly loved.