Complex sentence: "Karn Evil 9" includes vocal credit for Keith Emerson, and is Emerson's only official vocal credit on an ELP record, despite the fact that the only' vocals' he contributed to the song were those of the computer voice in the Third Impression.
Split into simpler sentences: Karn Evil 9 includes vocal credit for Keith Emerson, and is Emerson's only official vocal credit on an ELP record. The only vocals he contributed to the song were those of the computer voice in the Third Impression.