Complex sentence: He is then directed to Vogel, who represents the German Democratic Republic's Attorney General-who seeks to exchange a US grad student named Pryor, whom they have arrested, for Abel and official recognition of the GDR by the US.
Split into simpler sentences: He is then directed to Vogel, who represents the German Democratic Republic's Attorney General. They seek to exchange a US grad student named Pryor, whom they have arrested, for Abel and official recognition of the GDR by the US.