Complex sentence: While most winters have some measurable snow, significant snow is rare in Huntsville; but there have been some unusually heavy snowstorms, like the December 31,1963 New Year's Eve snowstorm, when fell within 24 hours.
Split into simpler sentences: While most winters have some measurable snow, heavy snow is rare in Huntsville. However, there have been some unusually heavy snowstorms, like the December 31,1963 New Year's Eve snowstorm, when fell within 24 hours.