Complex sentence: The NATO bombing of the Radio Television of Serbia headquarters occurred on 23 April 1999, during the Kosovo War, and NATO's aerial campaign against Yugoslavia severely damaging the Belgrade headquarters of Radio Television of Serbia (RTS).
Split into simpler sentences: The NATO bombing of the Radio Television of Serbia headquarters occurred on 23 April 1999, during the Kosovo War. It formed part of NATO's aerial campaign against Yugoslavia, and severely damaged the Belgrade headquarters of Radio Television of Serbia (RTS).