Complex sentence: During the ensuing battle Firepower overpowered and badly injured Stark, with matters made worse when Firepower's armor was revealed to be shielded from negator packs due to the government analyzing the device used on Stingray.
Split into simpler sentences: During the ensuing battle Firepower overpowered and badly injured Stark. Also Firepower's armor was shielding from negator packs due to the government analyzing the device used on Stingray.