Complex sentence: His first wife died in 1845, and on 16 August 1846, he married Olympe Pélissier, who had sat for Vernet for his picture of "Judith and Holofernes".
Split into simpler sentences: His first wife died in 1845, and on August 16,1846. He then married Olympe Pélissier, who had sat for Vernet for his picture of "Judith and Holofernes".