Complex sentence: She lived on Social Security and may have had another source of income, but the children she had taken care of in the early 1950s bought her an apartment in the Rogers Park area of Chicago and paid her bills.
Split into simpler sentences: She lived on Social Security and may have had another source of income. The children she had cared for in the early 1950s bought her an apartment in the Rogers Park area of Chicago and paid her bills.