Complex sentence: The population density was 60.4/km² (156.4/mi²) and there were 539 housing units at an average density of 28.0/km² (72.7/mi²).
Split into simpler sentences: The population density was 60.4/km² (156.4/mi²). There were 539 housing units at an average density of 28.0/km² (72.7/mi²).