Complex sentence: Over the next 10 days, the Germans used virtually every weapon at their disposal to try to destroy the bridge: infantry and armor, howitzers, mortars, floating mines, mined watercraft, a railroad gun, and a giant 540mm super-heavy mortar.
Split into simpler sentences: Over the next 10 days, the Germans used virtually every weapon at their disposal to try to destroy the bridge. This included infantry and armor, howitzers, mortars, floating mines, mined boats, a railroad gun, and a giant 540mm super-heavy mortar.