Complex sentence: The Vichy Regime--led by Philippe Pétain, the aging war hero of the First World War--was originally intended to be a temporary, care-taker regime, to supervise French administration before the soon-expected defeat of Britain.
Split into simpler sentences: The Vichy Regime was led by Philippe Pétain, the aging war hero of First World War. It was originally intended to be a temporary, care-taker regime, to supervise French administration before the soon-expected defeat of Britain.