Complex sentence: Guerreiro returned to the under-21s and helped them finish runners-up at the 2015 UEFA European Championship in the Czech Republic; he was one of five Portuguese in the Team of the Tournament.
Split into simpler sentences: Guerreiro returned to the under-21s for the 2015 UEFA European Championship in the Czech Republic, helping them finish in second place. He was one of five Portuguese included in the Team of the Tournament.