Translate the following English sentence to French:
"The dual legitimacy of the European Union by its European but also its national citizens, by its peoples but also its states, makes the European Union institutionally complex by its very nature."
La double légitimité conférée à l' Union européenne par le citoyen européen et par le citoyen national, par les peuples et par les États, la rend par nature complexe au plan institutionnel.