Complex sentence: Signed by Reggina Calcio in 2005, Biondini made his Serie A debut, which helped him earn a place in the 2006 UEFA European Under-21 Football Championship.
Split into simpler sentences: Signed by Reggina Calcio in 2005, Biondini made his Serie A debut. With the Italy U- 21 squad he took part at the 2006 UEFA European Under-21 Football Championship.