Complex sentence: With this passage in mind, Tim picked up his guitar and, as he sang, the words to the song flowed out, but he was not satisfied with the chorus and felt that it did not flow well with the song.
Split into simpler sentences: With this passage in mind, Tim picked up his guitar and, as he sang, the words to the song flowed out. However, he was not satisfied with the chorus and felt that it did not flow well with the song.