Complex sentence: She transferred to St. Louis University, and graduated with a degree in elementary education in 1985, then teaching 4th-6th grade for four years at Oak Hill/Villa Duchesne, until the birth of her first child.
Split into simpler sentences: She transferred to St. Louis University, graduating with a degree in elementary education in 1985. She then taught 4th-6th grade for four years at Oak Hill/Villa Duchesne, until the birth of her first child.