Complex sentence: When it became apparent they were at an impasse, Vallance elected to go, leaving two songs for the band, "N-N-N-No!" and "You're Like The Wind" (both credited to Rodney Higgs as songwriter).
Split into simpler sentences: When it became apparent they were at an impasse, Vallance elected to go. He did leave two songs for the band, "N-N-N-No!" and "You're Like The Wind" (both credited to Rodney Higgs as songwriter).