Complex sentence: William III (who would later also seize the throne of England, see Glorious Revolution) and Louis XIV, who, along with their respective allies, would be pitted against each other in a series of wars in the years that followed.
Split into simpler sentences: William III (who would later also seize the throne of England, see Glorious Revolution) and Louis XIV. They, along with their respective allies, would be pitted against each other in a series of wars in the years that followed.