Complex sentence: For some of his early appearances he and the Goblin were separate personalities; his Goblin side disdaining his human weaknesses, while his Norman Osborn persona was primarily motivated by his concern for Harry.
Split into simpler sentences: For some of his early appearances he and the Goblin were separate personalities. His Goblin side disdained his human weaknesses, while his Norman Osborn persona was primarily motivated by his concern for Harry.