Complex sentence: The RFSU's are unique and unconventional units who sole purpose is to conduct long range reconnaissance and surveillance patrols in the sparsely populated and remote regions of northern Australia.
Split into simpler sentences: The RFSU's are unique and unconventional units who specialise in long range reconnaissance and surveillance patrols. The role of the RFSUs is to conduct operational reconnaissance patrols in the sparsely populated and remote regions of northern Australia.