Complex sentence: Frehley's sole involvement for the studio songs was "Rocket Ride" which he originally wrote for a solo album; Ace sang the lead vocals and played both the guitar and bass on this song.
Split into simpler sentences: Frehley's sole involvement for the studio songs was "Rocket Ride" which he originally wrote for a solo album. Frehley sang the lead vocals and played both the guitar and bass on this song.