Complex sentence: The population of Mount Archer is very low so it is included in the population statistics for the adjoining locality of Velleneuve, which recorded a population of 440 at the 2011 Australian Census.
Split into simpler sentences: The population of Mount Archer is very low so it is included in the adjoining locality's population statistics. Velleneuve recorded a population of 440 at the 2011 Australian Census.