Complex sentence: Nenning's political views are "multicolored", and not confined to a single party, he calls himself "Rot--grün--hellschwarzer" (red--green--light-black, referring to socialism, greens and conservatism).
Split into simpler sentences: Nenning's political views were "multicolored", and not confined to a single party. He termed himself "Rot--grün--hellschwarzer" (red--green--light-black, referring to socialism, greens and conservatism).