Complex sentence: No Leaf Clover is consisted of many riffs which James Hetfield had created over the years of the band's history, it wasn't until Michael Kamen approached the band about the album that James completed the song that can be heard on the album.
Split into simpler sentences: No Leaf Clover consists of many riffs which James Hetfield had created over the years of the band's history. It wasn't until Michael Kamen approached the band about the album that James completed the song that can be heard on the album.