Complex sentence: The puppet state Vichy France had been established in 1940 following the German Occupation of France under of the rule of Philippe Pétain yet following Operation Overlord, the liberation of Paris and the fall of the Chambois pocket, it was dissolved.
Split into simpler sentences: The puppet state of Vichy France had been established in 1940 following the German Occupation of France under of the rule of Philippe Pétain. Following Operation Overlord, the liberation of Paris and the fall of the Chambois pocket, the Vichy regime was dissolved.