Complex sentence: In reality, Theresienstadt was a transit camp for Jews en route to extermination camps, but in a sophisticated propaganda effort, fake shops and cafés were erected to imply that the Jews lived in relative comfort.
Split into simpler sentences: In reality, Theresienstadt was a transit camp for Jews en route to extermination camps. In a sophisticated propaganda effort, fake shops and cafés were erected to imply that the Jews lived in relative comfort.