Complex sentence: Since the revelation that he is the son of Loki, he has also demonstrated knowledge of magic and spellcasting; though not appearing to have any innate magic ability of his own, he has shown skill in employing magical artifacts and rituals.
Split into simpler sentences: Since the revelation that he is the son of Loki, he has also demonstrated knowledge of magic and spell casting. Though not appearing to have any innate magic ability of his own, he has shown skill in employing magical artifacts and rituals.