Complex sentence: On 23 August 1944, as Soviet forces approached Romania, Romanian King Michael staged a coup and joined the Allies, after which Romania was split into two parts: one supporting King Michael and the other still supporting the Germans and Romanian fascist leader Ion Antonescu.
Split into simpler sentences: On 23 August 1944, as Soviet forces approached Romania, Romanian King Michael made a coup and joined the Allies. After that Romania was split into two parts, one supporting King Michael and other still supporting the Germans and Ion Antonescu.