Complex sentence: Discovering the ruse when the impostors failed to realize Professor X was currently unable to walk, Banshee recruited Sabretooth from a cell in the complex, aiding Banshee in saving Emma Frost and Jubilee from the beings.
Split into simpler sentences: Discovering the ruse when the impostors failed to realize Professor X was currently unable to walk, Banshee recruited Sabretooth from a cell in the complex. He then aided Banshee in saving Emma Frost and Jubilee from the beings.