Complex sentence: His son, François Clicquot, married Barbe-Nicole Ponsardin in 1798 and died in 1805, leaving his widow ("veuve" in French) in control of a company variously involved in banking, wool trading, and Champagne production.
Split into simpler sentences: His son, François Clicquot, married Barbe-Nicole Ponsardin in 1798. Clicquot died in 1805, leaving his widow ("veuve" in French) in control of a company variously involved in banking, wool trading, and Champagne production.