Complex sentence: Impersonating Senator Robert Kelly and Yuriko, the shape-shifting Mystique gains information about Magneto's prison and helps him escape, and she also leans of plans for another Cerebro.
Split into simpler sentences: Impersonating Senator Robert Kelly and Yuriko, the shape-shifting Mystique gains information about Magneto's prison and helps him escape. She also leans of plans for another Cerebro.