Complex sentence: Ghastly makes Valkyrie new clothes tells her about his mother, a Sensitive, who had a vision of Valkyrie dying screaming in pain in an effort to make Valkyrie quit magic and return to normal teenage life.
Split into simpler sentences: Ghastly makes Valkyrie new clothes and tells her about his mother, a Sensitive, who had a vision of Valkyrie dying and screaming in pain. In an effort he tries to make Valkyrie quit magic and return to normal teenage life.