Complex sentence: In modern times, heavy snowfalls have been infrequent with snow generally only settling once or twice each winter and accumulations usually of no more than an inch (2.5 cm) or so.
Split into simpler sentences: In modern times, heavy snowfalls have been infrequent. During recent winters, snow has generally only settled once or twice and it is rarely more than an inch (2.5 cm) or so.