Complex sentence: Not all rule changes have been adopted by all states and territories, a prominent example of this being the change to the urban speed limit from 60km/h to 50km/h not being adopted immediately in all states and not at all in the Northern Territory.
Split into simpler sentences: Not all rule changes have been adopted by all states and territories. A prominent example of this being the change to the urban speed limit from 60 km/h to 50 km/h not being adopted immediately in all states, and not at all in the Northern Territory.