Complex sentence: Chucky too returns to the Barclay residence entering through the fireplace and upon finding Andy, knocks him out whilst preparing to carry out the ritual however, Mike and Karen rescue Andy before the possession can take place.
Split into simpler sentences: Chucky too returns to the Barclay residence entering through the fireplace and upon finding Andy, knocks him out whilst preparing to carry out the ritual. However, Mike and Karen rescue Andy before the possession can take place.