Complex sentence: All the while, Kida is learning about the outside world and is adapting well, however she still feels guilty, as there could still be other Atlantean war machines in the world causing problems, like the Leviathan.
Split into simpler sentences: All the while, Kida is learning about the outside world and is adapting well. However, she still feels guilty, as there could still be other Atlantean war machines in the world causing problems, like the Leviathan.