Complex sentence: He developed a love of reading when he was recovering from seizures and an affinity for non-fiction and "The Great Brain" children's books in particular, with which he was enamored because the main character was always scheming to make money.
Split into simpler sentences: He developed a love of reading when he was recovering from seizures and an affinity for non-fiction and "The Great Brain" children's books. He stated he was enamored by the "The Great Brain" books as the main character was always scheming to make money.