Complex sentence: Christine pleads for him to show himself and he reveals himself in her mirror and takes her to his lair where he beseeches her to sing for him and shows a life--size doll resembling her in a wedding dress.
Split into simpler sentences: Christine pleads for him to show himself and he reveals himself in her mirror and takes her to his lair. There he beseeches her to sing for him and shows a life--size doll resembling her in a wedding dress.