Complex sentence: Initiated by French Prime Minister Raymond Poincaré, the invasion took place on January 11,1923, with the aim of occupying the centre of German coal, iron and steel production in the Ruhr area valley, in order to gain the money that Germany owed.
Split into simpler sentences: Initiated by French Prime Minister Raymond Poincaré, the invasion took place on January 11,1923. The French aimed to occupy the centre of German coal, iron, and steel production in the Ruhr area valley to get the money Germany owed.