Complex sentence: In 2004 Clouser produced the album "Size Matters" by the band Helmet, which consisted mainly of collaborations between Charlie Clouser and Page Hamilton, intended to be a Page Hamilton "solo" album.
Split into simpler sentences: In 2004 Clouser produced the album "Size Matters" by the band Helmet. Which was composed mainly of songs recorded by Charlie Clouser and Page Hamilton for what was to be a Page Hamilton "solo" album.