Complex sentence: Reimer observes that Jackman's alter ego exhibits rage, heightened senses, greatly superior strength and speed and a more playful and flirtatious manner and assures this persona she will keep his secrets just as she keeps Jackman's but asks for guarantees he will not harm her.
Split into simpler sentences: Reimer observes that Jackman's alter ego exhibits rage, heightened senses, greatly superior strength and speed, and a more playful and flirtatious manner. She assures this persona she will keep his secrets just as she keeps Jackman's, but asks for guarantees he will not harm her.