Complex sentence: In the 20th century however the industry vanished, and with it the prosperity of Schildhorst: all that remains is a sawmill, a cheesemaker's and a few traces of the glassworks.
Split into simpler sentences: In the 20th century, however, the industry left, and with it the prosperity of Schildhorst. All that remains is a sawmill, a cheesemaker and a few traces of the glassworks.