Complex sentence: This was better than the national average, but was skewed because of the high rate of development in the urban centers--in rural communities in Tamaulipas, access to running water was available in less than 40 percent of homes.
Split into simpler sentences: This was better than the national average, but was skewed because of the high rate of development in the urban centers. In rural communities in Tamaulipas, access to running water was available in less than 40 percent of homes.