Complex sentence: "The Glow-Worm" is a popular song with music was written by Paul Lincke, the original German lyrics by Heinz Bolten-Backers, with English lyrics by Johnny Mercer.
Split into simpler sentences: The Glow-Worm is a popular song. The music was written by Paul Lincke, the original German lyrics by Heinz Bolten-Backers, with English lyrics by Johnny Mercer.