Complex sentence: During his time in prison, Vikernes became affiliated with the Norwegian Heathen Front, had several writings on Germanic paganism published and recorded and released two electronic albums as Burzum.
Split into simpler sentences: During his time in prison he became affiliated with the Heathen Front and had several writings on Germanic paganism published. Goodrick-Clarke 2003: 204 He also recorded and released two electronic albums as Burzum.