Complex sentence: He was close to and held influence over the king's wife, Maria Luisa of Parma, and married into the royal family via the Countess of Chinchon, a cousin of the king.
Split into simpler sentences: He was close to and held influence over the king's wife, Maria Luisa of Parma. He married into the royal family via the Countess of Chinchon, a cousin of the king.