Complex sentence: To seal the area, the entire Brocken plateau was then surrounded by a concrete wall, built from 2,318 sections, each one 2.4 tons in weight and 3.60 meters high.
Split into simpler sentences: To seal the area, the entire Brocken plateau was then surrounded by a concrete wall. Build with 2,318 sections, each one 2.4 tons and 3.60 meters high.