Complex sentence: When the Black Widow touches one of her victims on the forehead, there is a burst of flame, they are instantly struck dead and their soul is sent to Hell; at the same time a mark is left in the shape of a spider.
Split into simpler sentences: When the Black Widow touches one of her victims on the forehead, there is a burst of flame, they are instantly struck dead and their soul is sent to Hell. At the same time a mark is left in the shape of a spider.