He had the control rods removed to demonstrate that the reactor would shut down without trouble, and it immediately blew up with a loud bang and a tall column of dark smoke, a turn of events that he had not anticipated.
He had the control rods. These control rods were removed to demonstrate that the reactor would shut down without trouble. He had not anticipated. This immediately blew up with a loud bang. This immediately blew up with a tall column of dark smoke. Dark smoke was a turn of events.