Complex sentence: D'Agostino sold to Udinese Calcio and Atalanta B.C. in summer 2005, in summer 2006 Atalanta got full ownership, and he was loaned to Cagliari, playing his first Serie A season.
Split into simpler sentences: D'Agostino sold to Udinese Calcio and Atalanta B.C. in summer 2005. In summer 2006 Atalanta got full ownership, and he was loaned to Cagliari, playing his first Serie A season.