Complex sentence: It is then revealed that David is an artificial human used as a replacement for a real child, and Monica tells Henry in private that David is "malfunctioning" and must be sent back to the factory at once.
Split into simpler sentences: It is then revealed that David is an artificial human, used as a replacement for a real child. Monica privately tells Henry that David is'malfunctioning' and must be sent back to the factory at once.