Complex sentence: However, he's also impulsive, brash and quick to anger; when Tendou managed to infiltrate his flawless security team and upstage him by revealing how a Worm had done the same, he was so angry that he immediately challenged Kabuto to a fight.
Split into simpler sentences: However, he's also impulsive, brash and quick to anger. When Tendou managed to infiltrate his flawless security team and upstage him by revealing how a Worm had done the same, he was so angry that he immediately challenged Kabuto to a fight.