Complex sentence: The Karenni National People's Liberation Front (KNPLF) was an insurgent group operating in Kayah State (Karenni State), Myanmar (Burma), and became a "Border Guard Force" on 8 November 2009.
Split into simpler sentences: The Karenni National People's Liberation Front (KNPLF) was an insurgent group operating in Kayah State (Karenni State), Myanmar (Burma). It became a "Border Guard Force" on 8 November 2009.