Complex sentence: Bachman says he then handed over the lyrics to Fred Turner with the thought that Turner would sing the lead vocal, but Turner handed them back saying Randy should sing the lead as it would give himself a needed vocal break when the band performed live.
Split into simpler sentences: Bachman says he then handed over the lyrics to Fred Turner with the thought that Turner would sing the lead vocal. But Turner handed them back, saying Randy should sing the lead as it would give himself a needed vocal break when the band performed live.