Complex sentence: After spending only half a season with the club, Cissokho departed Vitória for the league's defending champions Porto, where he won the Portuguese league and cup double and played in the UEFA Champions League for the first time.
Split into simpler sentences: After spending only 1/2 the season with the club, Cissokho departed Vitória for the league's defending champions Porto. With Porto, Cissokho won the Portuguese league and cup double and played in the UEFA Champions League for the first time.