Complex sentence: Clarkson criticized the handling characteristics, proposing that if the vehicle was better at negotiating corners and bends in the track at higher speeds than at lower speeds, on a wet track or cold road surface, the slow speed handling would deteriorate further.
Split into simpler sentences: Clarkson criticized the handling characteristics proposing that if the vehicle was better at negotiating corners and bends in the track at higher speeds than at lower speeds. On a wet track or cold road surface, the slow speed handling would deteriorate further.