Complex sentence: Prior to that, he won the Under-21 World Championships and Under-16 European Championships with Portugal junior sides, alongside Rui Costa and João Pinto and he was also a significant part of Portugal's "Golden Generation".
Split into simpler sentences: Prior to that, he won the Under-21 World Championships and Under-16 European Championships with Portugal junior sides alongside Rui Costa and João Pinto. He was also a significant part of Portugal's "Golden Generation".