Complex sentence: Poverty and income disparity has been a persistent problem in Mexico, and while the recent exponential growth of the economy has caused an overall fall in the percentage of the population living in conditions of poverty, this fall has not been proportional to the general growth.
Split into simpler sentences: Poverty and income disparity has been a persistent problem in Mexico. While the recent exponential growth of the economy has caused an overall fall in the percentage of the population living in conditions of poverty, this fall has not been proportional to the general growth.