Complex sentence: Knark is named after a Swedish and Norwegian slang term for "illegal drugs" or "narcotics", and are by programmers speaking those languages sometimes used as a metasyntactic variable, like foo or bar.
Split into simpler sentences: Knark is named after a Swedish and Norwegian slang term for "illegal drugs" or "narcotics". In programming,'knark' is sometimes used as a metasyntactic variable, like foo or bar.