Complex sentence: About 22.9% of families and 25.2% of the population were below the poverty line, including 35.2% of those under age 18 and 14.4% of those age 65 or over.
Split into simpler sentences: About 22.9% of families and 25.2% of the population were below the poverty line. Out of the total people living in poverty, 35.2% were under age 18 and 14.4% were age 65 or over.