Complex sentence: William, the Stadtholder of the Dutch Republic, replaced James with the support of English Whigs, to ensure England's entry into his League of Augsburg against France in the Nine Years War.
Split into simpler sentences: William, the Stadtholder of the Dutch Republic, replaced James with the support of English Whigs. One of William's aims was to ensure England's entry into his League of Augsburg against France in the Nine Years War.