Complex sentence: In his two-year spell the club renewed its domestic supremacy and participated in the UEFA Champions League, with the player contributing significantly; during this period he also had a successful trial with Sunderland, but could not negotiate a deal.
Split into simpler sentences: In his two-year spell the club renewed its domestic supremacy and participated in the UEFA Champions League, with the player contributing significantly. During this period he also had a successful trial with Sunderland, but could not negotiate a deal.