Complex sentence: Upon returning to Espanyol he became a defensive centerpiece in the side, alongside another club trainee, Daniel Jarque; his La Liga debut came on 1 October 2006 in a 0--0 away draw against CA Osasuna.
Split into simpler sentences: Upon returning to Espanyol, he became a defensive centerpiece in the side, alongside another club trainee, Daniel Jarque. His La Liga debut came on 1 October 2006, in a 0--0 draw at CA Osasuna.