Complex sentence: Aside from near-complete invisibility and flight, Kena is revealed to have developed no other magical powers despite being a highly capable student, and is frequently absent from class, a point that annoys Akuto to no end.
Split into simpler sentences: Aside from near-complete invisibility and flight, Kena does not seem to exhibit other magic abilities. She is a highly capable student, and but frequently absent from class, a point that annoys Akuto to no end.