Complex sentence: Most of the panoramic carriages are expected to be bumped from front line service in the next two years with new carriages to be constructed at Hillside Workshops, although they are likely to be retained as new charter fleet cars or be on-sold.
Split into simpler sentences: Most of the panoramic carriages are expected to be removed from front-line service in the next two years with new carriages to be constructed at Hillside Workshops. They may be retained as new charter fleet cars or be on-sold.