Complex sentence: Although Crossbones does not have any superhuman powers, he is still a very dangerous combatant; he kills lesser superheroes and villains with ease and has gone toe-to-toe with Captain America on a number of occasions.
Split into simpler sentences: Although Crossbones does not have any superhuman powers, he is still a very dangerous combatant. He kills lesser superheroes and villains with ease and has gone toe-to-toe with Captain America on a number of occasions.