Complex sentence: Her mother, Herminia Lerma, moved with her parents to Kingsville from Starr County and they worked in the fields so that she was not able to receive an education past third grade.
Split into simpler sentences: Her mother, the former Herminia Lerma, moved with her parents from Starr County to Kingsville. The Lermas worked in the fields so that Herminia was not able to receive an education past third grade.