Complex sentence: One important case revolved around Catherine Deshayes Monvoisin, a witch and midwife, known as "La Voisin", witchcraft and poisoning, and burned at the stake on February 22,1680.
Split into simpler sentences: One important case revolved around Catherine Deshayes Monvoisin, alleged witch and midwife, familiarly known as "La Voisin". Accused of and condemned for witchcraft and poisoning, she was burned at the stake on February 22,1680.