Complex sentence: In 1974, Mac Davis, working on a new album wrote the song Stop and Smell the roses this was a phrase Doc Severinsen had mentioned to Mac who co-credited Doc as writer of the song.
Split into simpler sentences: In 1974, Mac Davis, while working on a new album wrote the song Stop and Smell the Roses. This was a phrase Doc Severinsen had mentioned to Mac who co-credited Doc as writer of the song.