Complex sentence: Therefore the driver of the suspect vehicle, having passed the Kombi, is highly unlikely to have carried out a reverse park manoeuver on an unrestricted stretch of highway if his intention was to physically stop the target vehicle and its occupants from progressing any further.
Split into simpler sentences: Therefore the driver of the suspect vehicle having passed the Kombi is highly unlikely to have carried out a reverse park manoeuver on an unrestricted stretch of highway. If his intention was to physically stop the target vehicle and it's occupants from progressing any further.