Complex sentence: Jean Grey, Cyclops, Storm, Iceman and Beast work together to rescue trapped students and defeat Juggernaut-although Magneto and Mystique escape with the Tesseract.
Split into simpler sentences: Jean Grey, Cyclops, Storm, Iceman and Beast work together to rescue trapped students and defeat Juggernaut. However, Magneto and Mystique escape with the Tesseract.