Complex sentence: Coupland and his assistants settle in an isolated house in the countryside to keep experimenting on Jane, whose negative energy takes the form of "Evey", an infant doll-like creature only Jane sees.
Split into simpler sentences: Coupland and his assistants settle in an isolated house in the countryside to keep experimenting on Jane. Jane's negative energy takes the form of "Evey," an infant doll-like creature only Jane sees.