Complex sentence: Shortly thereafter, Poledra appears in the guise of a wolf, bringing with her an orphaned cub, and joins the travelling party, though her identity is concealed from both characters and reader until the next book.
Split into simpler sentences: Shortly thereafter, Poledra appears in the guise of a wolf, bringing with her an orphaned cub, and joins the travelling party. Her identity is concealed from both characters and reader until the next book.