Complex sentence: He was part of the Chile national under-20 football team, who played the 2013 South American Youth Championship in Argentina and joined the first team for the 2013 FIFA U- 20 World Cup based in Turkey, where they reached the quarter-finals.
Split into simpler sentences: He was part of the Chile national under-20 football team, who played the 2013 South American Youth Championship in Argentina. He also joined the first team for the 2013 FIFA U- 20 World Cup based in Turkey, where they reached the quarter-finals.