Complex sentence: Population density (121.85 per km²) is significantly higher than the national average (70); the birth, marriage, and divorce rates are also higher; the death rate and the unemployment rate (7.34%, 2005) are lower.
Split into simpler sentences: Population density (121.85 per km²) is significantly higher than the national average (70). The birth, marriage, and divorce rates are also higher; the death rate and the unemployment rate (7.34%, 2005) are lower.