Complex sentence: French repeated efforts to annex the left bank of the Rhine started with the devastating wars of King Louis XIV and were fully implemented during the Napoleonic Wars and the creation of the Confederation of the Rhine in 1806--1813.
Split into simpler sentences: French repeated efforts to annex the left bank of the Rhine started with the devastating wars of King Louis XIV. These politics were fully implemented during the Napoleonic Wars and the creation of the Confederation of the Rhine in 1806--1813.