Complex sentence: In 2004, he recovered his form and, along with Jorge Pellicer, he was an important player for Universidad Catolica, but he suffered another important injury, this time a broken knee.
Split into simpler sentences: In 2004, Gutiérrez recovered his form and, along with Jorge Pellicer, he became an important player for Universidad Catolica. However, he suffered another serious injury, this time a broken knee.