Complex sentence: King Michael's Coup refers to the coup d'etat led by King Michael of Romania on 23 August 1944 against the pro-Nazi Romanian faction of Ion Antonescu, after the Axis front in Northeastern Romania collapsed under the Soviet offensive.
Split into simpler sentences: King Michael's Coup was a "coup d'état" led by King Michael of Romania during World War II on 23 August 1944. The king removed the government of Ion Antonescu, which had aligned Romania with Nazi Germany, after the Axis front in northeastern Romania collapsed in the face of a successful Soviet offensive.