Complex sentence: The Kniteforce web shop morphed into the All-4-1 site which also became the main outlet for the other labels, and the entire back catalogue of Kniteforce and its related labels and releases became available through a Create Your Own CD feature on the site.
Split into simpler sentences: The Kniteforce web shop morphed into the All-4-1 site, which also became the main outlet for the other labels. The entire back catalogue of Kniteforce and its related labels and releases became available through a "create your own CD" feature on the site.