Complex sentence: Although she is grateful to Lord Gro for saving her from Corinius, she does not love him nor do any of the other lords of Demonland seem to think of her as a potential wife.
Split into simpler sentences: Although she is grateful to Lord Gro for saving her from Corinius, she does not love him. Oddly, none of the other lords of Demonland seem to think of her as a potential wife.