Complex sentence: The United States'National Association of Secondary School Principals (NAASP) opposes the use of corporal punishment in schools, defined as the deliberate infliction of pain in response to students' unacceptable behaviour and/or language.
Split into simpler sentences: The United States'National Association of Secondary School Principals (NAASP) opposes the use of corporal punishment in schools. They define "corporal punishment" as the deliberate infliction of pain on students in response to students' unacceptable behaviour and/or language.