Complex sentence: Louis de Chastillon, a French painter in enamel and miniature, and an engraver, was born at Ste. Ménehould in Champagne about 1639.
Split into simpler sentences: Louis de Chastillon (c.1639--1734) was a French painter in enamel and miniature, and an engraver. Chastillon was born at Ste. Ménehould in Champagne about 1639.