Complex sentence: After the explanation, Blackheart, whose body supposed to be hidden by Blade, manage to reawaken himself and escape to find where Ghost Rider and Mephisto's whereabout, as his immediately grows immensely powerful--though is taken down by Johnny.
Split into simpler sentences: After the explanation, Blackheart, whose body was supposed to be hidden by Blade, manage to reawaken itself and escape to find Ghost Rider's and Mephisto's whereabouts. He immediately grows immensely powerful--though is taken down by Johnny.