Complex sentence: Decline in economic importance marked both towns during the nineteenth century, in which painter Vincent van Gogh briefly lived in the municipality, up to nowadays being the most famous citizen in the history of Etten and Leur.
Split into simpler sentences: Decline in economic importance marked both towns during the nineteenth century. During this time the painter Vincent van Gogh briefly lived in the municipality, making him the most famous citizen in the history of Etten and Leur.