Complex sentence: However, property value is not the only way to determine which is wealthier, and it does become difficult to compare the three with each having drastically different land area, or with Greenwich having three times the population of Darien or New Canaan.
Split into simpler sentences: However, property value is not the only way to determine which is wealthier. In addition, Greenwich has, or three times the population of Darien or New Canaan.