Complex sentence: Anti-personnel shells are designed to fragment into many pieces and affectt a wide area, armour-piecing rounds are specially hardened to penetrate armour and smoke ammunition covers an area with a fog that screens people from view.
Split into simpler sentences: Anti-personnel shells are designed to fragment into many pieces and can affect a large area. Armor-piercing rounds are specially hardened to penetrate armor, while smoke ammunition covers an area with a fog that screens people from view.