Complex sentence: To counter the danger of bullet splash or fragments knocked off the inside of the hull, crews were issued with leather-and-chainmail masks and a leather helmet was also issued, to protect the head against projections inside the tank.
Split into simpler sentences: To counter the danger of bullet splash or fragments knocked off the inside of the hull, crews were issued with leather-and-chainmail masks. A leather helmet was also issued, to protect the head against projections inside the tank.