Simplify the following text for a Grade 10 native English-speaking person.
Original: Polar lows have been also known as by using many other terms , such as comma cloud , mesocyclone , polar mesoscale vortex , Arctic hurricane , Arctic low , and cold air depression .
Simplified: Polar lows have been referred to by many other terms , such as polar mesoscale vortex , Arctic hurricane , Arctic low , and cold air depression .