Complex sentence: The X- 66 only contained 12 tonewheels, and used electronics for frequency division, and contained separate "vibrato bass" and "vibrato treble" in an attempt to simulate a Leslie speaker.
Split into simpler sentences: The X- 66 contained just 12 tonewheels, and used electronics for frequency division. It contained separate "vibrato bass" and "vibrato treble" in an attempt to simulate a Leslie speaker.