Complex sentence: Still unable to shake his suspicions about the hot tub, Margarite investigates and finds out that the hot tub came alive after being struck by lightning and killed its original owner and later escaped from a mental hospital (Research).
Split into simpler sentences: Still unable to shake his suspicions about the hot tub, Margarite investigates its past, learning that it came alive after being struck by lightning and killed its original owner. It later escaped from a mental hospital (Research).