Complex sentence: In 1963, she attended beauty school in Tupelo, Mississippi, and became a hairdresser; she would renew her cosmetology license every year for the rest of her life, just in case she should have to go back to a daily job.
Split into simpler sentences: In 1963, she attended beauty school in Tupelo, Mississippi, where she learned to be a hairdresser. She continued to renew her cosmetology license every year for the rest of her life--just in case she ever had to go back to a daily job.