Complex sentence: In 1675, when Vermeer went on several business trips for his mother-in-law, to Gouda, when her husband had died, and to Amsterdam, and there he cheated her and borrowed money on her name.
Split into simpler sentences: In 1675, when Vermeer went on several business trips for his mother-in-law, first to Gouda, when her husband had died, and then to Amsterdam. There he cheated her and borrowed money on her name.