Complex sentence: He was part of the 1948 Olympic team (that won the bronze medal) as a reserve, but competed for the team at the 1949 Trofeo Italia and 1950 European Championships where the team won the gold medal.
Split into simpler sentences: He was part of the 1948 Olympic team, that won the bronze medal, as a reserve. He competed for the team at the 1949 Trofeo Italia and 1950 European Championships where the team won the gold medal.