Complex sentence: These towers were adopted symbolically, particularly in Romanesque architecture, as corner turrets and flourished in Norman and Gothic architecture as large towers, reaching their height of magnificence at Cologne Cathedral, where they were not completed until the late 19th century.
Split into simpler sentences: These towers were adopted symbolically, particularly in Romanesque architecture, as corner turrets. They flourished in Norman and Gothic architecture as large towers, reaching their height of magnificence at Cologne Cathedral, where they were not completed until the late 19th century.