Complex sentence: The carriage allowed a towing speed of up to 50 km/h on paved road and up to 35 km/h on a country road, although the gun could also be moved by a team of six horses, in which case a limber was used.
Split into simpler sentences: The carriage allowed towing speed of up to 50 km/h on paved road and up to 35 km/h on country road. The gun could also be moved by a team of six horses, in this case a limber was used.