Complex sentence: January of 2003 saw a record high January temperature of 63 ° F (17 ° C), record low January snowfall (a trace), and was one of the warmest, least-snowy winters on record.
Split into simpler sentences: January of 2003 saw a record high January temperature of 63 ° F (17 ° C) and record low January snowfall (a trace). That winter was one of the warmest, least-snowy winters on record.