Complex sentence: High winds, hail, excessive precipitation, and wildfires are forms and effects of severe weather, as are thunderstorms, downbursts, lightning, tornadoes, waterspouts, tropical cyclones, and extratropical cyclones.
Split into simpler sentences: High winds, hail, excessive precipitation, and wildfires are forms of severe weather. Severe weather is caused by thunderstorms, downbursts, lightning, tornadoes, waterspouts, tropical cyclones, and extratropical cyclones.