Complex sentence: Louis Henri de Pardaillan de Gondrin, marquis de Montespan (1640--1 December 1691), was a French nobleman, most notable as the husband of Louis XIV's mistress Madame de Montespan.
Split into simpler sentences: Louis Henri de Pardaillan de Gondrin (1640--1 December 1691), marquis of Montespan, was a French nobleman. He is most notable as the husband of Louis XIV's mistress Madame de Montespan.