Complex sentence: Leulliot, who had been manager of the French team that won the Tour in 1937, had become head of sport at "La France Socialiste" which, despite its name, was a right-wing paper that sympathised with the Germans.
Split into simpler sentences: Leulliot, who had been manager of the French team that won the Tour in 1937, had become head of sport at "La France Socialiste". Despite its name, it was a right-wing paper that sympathised with the Germans.