Complex sentence: In Europe, lead production only began to revive in the 11th and 12th centuries, where it was again used for roofing and piping; from the 13th century, lead was used to create stained glass.
Split into simpler sentences: In Europe, lead production only began to revive in the 11th and 12th centuries, where it was again used for roofing and piping. Starting in the 13th century, lead was used to create stained glass.