Complex sentence: When the connection process fails, Tobio regains his senses, only to come under attack from a robot disposal tank piloted by Tenma, Honda, and Ushiyama, but something goes wrong and the tank malfunctions and goes berserk.
Split into simpler sentences: When the connection process fails, Tobio regains his senses, only to come under attack from a robot disposal tank piloted by Tenma, Honda, and Ushiyama. Something goes wrong and the tank malfunctions and goes berserk.