Complex sentence: Myra dresses as a nurse to deceive her to believing she is hospitalised; yet, Myra insists she is "borrowing" the girl to demonstrate her psychomancy to a police investigator (Patrick Magee) in helping him find the missing girl.
Split into simpler sentences: Myra dresses as a nurse to deceive her to believing she is hospitalised. However, Myra insists she is "borrowing" the girl to demonstrate her psychomancy to a police investigator (Patrick Magee) in helping him find the missing girl.