Complex sentence: Each season finale signifies a turning point for the main characters--usually Buffy--and her confronting the Master, according to Stevenson, represents "the end of her childhood illusions of immortality".
Split into simpler sentences: Each season finale signifies a turning point for the main characters--usually Buffy. Buffy's confronting the Master, according to Stevenson, represents "the end of her childhood illusions of immortality".