Complex sentence: The "Ice and Fire" narrative can be considered to be set in a post-magic world where people no longer believe in supernatural things such as the Others, and while the characters understand the natural aspects of their world, they cannot comprehend its magical elements.
Split into simpler sentences: The "Ice and Fire" narrative is set in a post-magic world where people no longer believe in supernatural things such as the Others. Although the characters understand the natural aspects of their world, they do not know or understand its magical elements.