Complex sentence: In the middle of the 20th century, Biot once again became famous for its pottery--decorative pottery and glassworks, and is now well known for its glassblowers and bubble glass products.
Split into simpler sentences: In the middle of the 20th century, Biot once again became famous for its pottery (decorative pottery and glassworks). Today, Biot is well known for its glassblowers and bubble glass products.