Complex sentence: The range includes 15,30, and 100-watt models in both head and combo form; the 15 and 30-watt combos were called "substantial amps that provide substantial tones" in "Vintage Guitar".
Split into simpler sentences: The range includes 15,30, and 100-watt models in both head and combo form. The 15 and 30-watt combos were called "substantial amps that provide substantial tones" in "Vintage Guitar".