Complex sentence: Also, with the signing of Moises Alou on November 20,2006, Valentin agreed to give up his number 18 so that Alou could wear it, while he chose to wear the number 22 for the 2007 season.
Split into simpler sentences: Also, with the signing of Moises Alou on November 20,2006, Valentin agreed to give up his number 18 so that Alou could wear it. Valentín has decided to wear the number 22 for the 2007 season.