Complex sentence: He married Adélaïde Flore Belleville who, after his death, remarried in 1800 to the chemist Antoine François, comte de Fourcroy who was the brother of lexicographer Noël François de Wailly.
Split into simpler sentences: He married Adélaïde Flore Belleville who, after his death, remarried in 1800 to the chemist Antoine François, comte de Fourcroy. He was the brother of lexicographer Noël François de Wailly.