Complex sentence: Abram Hoffer (November 11,1917--May 27,2009) was a Canadian biochemist, physician and psychiatrist who developed a theory that nutrition and vitaminss may be effective treatments for schizophrenia.
Split into simpler sentences: Abram Hoffer (November 11,1917--May 27,2009) was a Canadian biochemist, physician and psychiatrist. Dr Hoffer developed a theory that nutrition and vitamins may be effective treatments for schizophrenia.