Complex sentence: Commercial dog walkers in some regions are required to obtain a license for dog walking along with inspection of the vehicle that is used to transport dogs for commercial walking and limitation over the number of dogs that can be walked at one time.
Split into simpler sentences: Commercial dog walkers in some regions are required to obtain a license for dog walking along with inspection of the vehicle that is used to transport dogs for commercial walking. Such licenses sometimes limit the number of dogs that can be walked at one time.