Complex sentence: He boasts that she won't be able to beat him as easily as she thought, despite being two ranks higher, because it has been years since she was an Espada, and the current Espada are stronger than they used to be.
Split into simpler sentences: He boasts that she won't be able to beat him as easily as she thought, despite being two ranks higher because it has been years since she was an Espada. And the current Espada are stronger than they used to be.