Complex sentence: Seeking a cure for the transformation spell, Sophie travels into the Wastes, but instead finds a cursed living scarecrow whom she calls "Turnip Head," and who takes her to Howl's castle.
Split into simpler sentences: Seeking a cure for the transformation spell, Sophie travels into the Wastes. It is there she encounters a living scarecrow which she names "Turnip Head," and her new friend leads her to Howl's castle.