Complex sentence: Caleb manages to return Nathan's key-card when he awakes, but between Nathan's lies, how realistic Kyoko appeared, and his confinement in the house being similar to that of the androids, Caleb fears he too might be an android.
Split into simpler sentences: Caleb manages to return Nathan's key-card when he awakes. Between Nathan's lies, how realistic Kyoko appeared, and his confinement in the house being similar to that of the androids, Caleb fears he too might be an android.