Complex sentence: Paul speaks with great authority but questionable accuracy on the highlights of Paris up to the point of even contradicting a tour guide at the Musée Rodin, and insisting that his knowledge of Rodin's relationships is more accurate than that of the guide.
Split into simpler sentences: Paul speaks with great authority but questionable accuracy on the highlights of Paris. Paul contradicts a tour guide at the Musée Rodin, and insists that his knowledge of Rodin's relationships is more accurate than that of the guide.