Complex sentence: Supremo personifies evil, but he was once Sandrino, a lonely child raised by an evil vampire, who confers on him the enchantment of the cursed ink when he was barely out of his teens.
Split into simpler sentences: Supremo personifies evil, but he was once Sandrino. Suffering a loveless childhood, he is raised by an evil vampire, who confers on him the enchantment of the cursed ink when he was barely out of his teens.