Complex sentence: Powered augers designed to drill large holes through ice for winter fishing may be mounted on a snow vehicle, or a tractor or sled; hole diameters can be as high as 350 mm. These rigs have been produced commercially in both the US and the USSR.
Split into simpler sentences: Powered augers designed to drill large holes through ice for winter fishing may be mounted on a snow vehicle, or a tractor or sled. These have been produced commercially in both the US and the USSR.