Complex sentence: Defending the city, Captain America and his allies quickly fall to the Skull's powers; but while the Skull is distracted by Alicia Grimm's animated clay constructs, Captain America kills the would-be child dictator and liberates his unwilling followers.
Split into simpler sentences: Defending the city, Captain America and his allies quickly fall to the Skull's powers. But while the Skull is distracted by Alicia Grimm's animated clay constructs, Captain America kills the would-be child dictator and liberates his unwilling followers.