Complex sentence: At this moment, Black, stationed on a maintenance cradle outside a window, shoots Verdain with a tranquilliser gun and Helga turns off the lights: in the confusion, Black and his accomplice, abducting Verdain, escape the Hotel Imperial in a saloon car.
Split into simpler sentences: At this moment, Black, stationed on a maintenance cradle on the other side of a window, shoots Verdain with a tranquilliser gun. Helga switches off the lights, and in the confusion, Black and his accomplice abduct Verdain and depart from the hotel in a saloon car.