Complex sentence: Her mother moved to Portland, Oregon, soon after her brother Willie was born in 1933 (although after reaching adulthood Willie was able to locate their mother), and her father remarried and also moved away, leaving them to be raised by their paternal grandparents.
Split into simpler sentences: Her mother moved to Portland, Oregon soon after her brother Willie was born in 1933 (Willie later relocated their mother when he reached adulthood). Her father remarried and also moved away, leaving them to be raised by their paternal grandparents.