Complex sentence: In the 2009 summer, de la Bella signed with Real Sociedad in the same category, as a replacement for Athletic Bilbao-bound Xabier Castillo; during the league campaign, he was also first-choice, but achieving La Liga promotion this time.
Split into simpler sentences: In the 2009 summer, de la Bella signed with Real Sociedad in the same category, as a replacement for Athletic Bilbao-bound Xabier Castillo. During the league campaign, he was also first-choice, but achieving La Liga promotion this time.