Complex sentence: Indefinite detention is the incarceration of an arrested person by a national government or law enforcement agency without a trial, and violates many national and international laws, including human rights laws.
Split into simpler sentences: Indefinite detention is the incarceration of an arrested person by a national government or law enforcement agency without a trial. It is a controversial practice on the part of any government or agency that is in violation of many national and international laws, including human rights laws.