Complex sentence: Between Salisbury and Dutton Park the existing line is used by freight trains traveling to the Port of Brisbane and a terminal at Acacia Ridge, and the expected rise in the number of passengers services may interrupt freight services unless a new line is built.
Split into simpler sentences: Between Salisbury and Dutton Park the existing line is used by freight trains traveling to the Port of Brisbane and a terminal at Acacia Ridge. The expected rise in the number of passengers services may interrupt freight services unless a new line is built.