Complex sentence: The Act established the'tripartite' model of policing, which formed Police Authorities and gave a three way balance of power between the Chair of the Authority, the Chief Constable and the Home Secretary.
Split into simpler sentences: The Act established the'tripartite' model of policing, which formed Police Authorities. This established a three-way balance of power between the Authority's Chairman, the Chief Constable and the Home Secretary.