Complex sentence: Then Woodward realized that PZT material and the dielectric of a capacitor were very similar, so he built devices that are made exclusively of PZT disks, without any conventional capacitor, applying different signals to different portions of the cylindrical stack.
Split into simpler sentences: Then Woodward realized that PZT material and the dielectric of a capacitor were very similar. So he built devices that are made exclusively of PZT disks, without any conventional capacitor, applying different signals to different portions of the cylindrical stack.