Complex sentence: The song is about the protagonist being in love with a girl who treats him badly, however he still tries everything to be with her and doesn't give up, maintaining the fact that she is' just the girl I'm looking for'.
Split into simpler sentences: The song is about the protagonist being in love with a girl who treats him badly. He still tries everything to be with her and doesn't give up, maintaining that she's'just the girl I'm looking for'.