Complex sentence: After crossing into Spain he was stopped by Spanish border guards who handed him over to the Germans, and it is believed he was betrayed by French double agent Jean-Louis Ortet, codename "Armand".
Split into simpler sentences: After crossing into Spain he was stopped by Spanish border guards who handed him over to the Germans. It is believed he was betrayed by French double agent Jean-Louis Ortet, codename "Armand".