Complex sentence: The current mission of the 51st Battalion, FNQR is that of an RFSU, with the unit tasked with conducting land based and littoral surveillance and reconnaissance in support of national security operations in the inhospitable areas along the northern coast of Australia.
Split into simpler sentences: The current mission of the 51st Battalion, FNQR is that of a Regional Surveillance Force unit. It is responsible for providing surveillance and reconnaissance in the inhospitable areas along the northern coast of Australia.