Original sentence: Fuji, now obsessed with his work, believes he can simply try again, troubling Mewtwo with the idea his friend can be cast aside.However the process is unstable and Ai dies.To stabilize him, his memories of the events are erased, and they put him under sedation until he matures
Edited sentence: However the process is unstable and Ai dies, and to stabilize a traumatized Mewtwo, his memories are erased and he is put under sedation until he matures