Complex sentence: Claiming to be an extraterrestrial from a planet called'K-PAX' about one thousand light years away, Prot (Kevin Spacey) is committed to the Psychiatric Institute of Manhattan where psychiatrist Mark Powell (Jeff Bridges) begins to evaluate him as a delusional.
Split into simpler sentences: Claiming to be an extraterrestrial from a planet called'K-PAX', which is said by Prot to be about one thousand light years away. "Prot" (Kevin Spacey) is committed to the Psychiatric Institute of Manhattan where psychiatrist Mark Powell (Jeff Bridges) begins to evaluate him as a delusional.