Complex sentence: Rio studied at the Colégio Alemão do Porto (Porto's German School), and earned his degree in economics at the University of Porto, where he was president of the Student Association, and a member of the Pedagogical Council.
Split into simpler sentences: Rio studied at the Colégio Alemão do Porto (Porto's German School), and earned his degree in economics at the University of Porto. There, he was president of the Student Association, and a member of the Pedagogical Council.