Complex sentence: During the book, Squirrelflight struggles with Brambleclaw's hostility toward her, and at the same time she and Ashfur grow much closer, and she wonders if she loves him as she had loved Brambleclaw.
Split into simpler sentences: During the book, Squirrelflight struggles with Brambleclaw's hostility toward her. At the same time, she and Ashfur grow much closer; she wonders if she loves him as she had loved Brambleclaw.