Complex sentence: Her plans are confounded by the discovery that she has a brother, Calum: a brother strangely possessed by their mother; a brother with a terrifyingly violent streak; a brother whose dangerous love and strange way of seeing the world transform Nikki's life.
Split into simpler sentences: Her plans are confounded by the discovery that she has a brother Calum. A brother strangely possessed by their mother; a brother with a terrifyingly violent streak; a brother whose dangerous love and strange way of seeing the world transform Nikki's life.