Complex sentence: Unlike Glowface, he never stays in one place for long, and it was never actually revealed that he is part of S.N.A.F.U., but he is "The most evil of all evil spies".
Split into simpler sentences: Unlike Glowface, he never stays in one place for long. It was never actually revealed that he is part of S.N.A.F.U., but he is "The most evil of all evil spies".