Complex sentence: At the outset, the new queen had limited political influence with her husband, who blocked several of her candidates, including Choiseul, from taking important positions, with the support of his two most important ministers, Chief Minister Maurepas and Foreign Minister Vergennes.
Split into simpler sentences: At the outset, the new queen had limited political influence with her husband. Louis blocked several of her candidates, including Choiseul, from taking important positions, with the support of his two most important ministers, Chief Minister Maurepas and Foreign Minister Vergennes.