Complex sentence: The label was created to release Mike Patton's band Fantômas' self-titled début, whilst retaining "all the creative control", and by the Melvins'--friends of Werckman and Patton's--need for a label.
Split into simpler sentences: The label was created to release Mike Patton's band Fantômas' self-titled début, in an attempt to retain "all the creative control". Its inception was cemented by the Melvins'--friends of Werckman and Patton's--need for a label.