Complex sentence: During the 3rd and 2nd centuries BC Roman light infantry known as velites would carry seven veruta into combat, proving to be quite effective weapons, even against war elephants as proven in the battle of Zama.
Split into simpler sentences: During the 3rd and 2nd centuries BC, Roman light infantry (velites) would carry seven veruta into combat. It proved to be quite an effective weapon, even against war elephants as proven in the battle of Zama.