Complex sentence: Louis XIV of France had become infamous for the persecution of Protestants within his own realm, and the destruction of the Rhineland region by his forces was seen by many in Britain as a sign that the Palatines were likewise objects of his religious tyranny.
Split into simpler sentences: Louis XIV of France had become infamous for the persecution of Protestants within his realm. The invasion and destruction of the Rhineland region by his forces was considered by many in Britain as a sign that the Palatines were likewise objects of his religious tyranny.