Complex sentence: This gives it conditional allowance to exercise the powers available to a constable of a territorial police force; if an offence or incident is encountered outwith their natural jurisdiction, and to provide officers and specialist units to territorial police forces on a mutual assistance basis.
Split into simpler sentences: This gives it conditional allowance to exercise the powers available to a constable of a territorial police force; if an offence or incident is encountered outwith their natural jurisdiction. Additionally the MDP is able to provide officers and specialist units to territorial police forces on a mutual assistance basis.