Complex sentence: After deciding that she cannot look after her baby, she leaves Chicago, abandoning Susie on a flustered and overworked Susan, who struggles to be a good mother to the child while completing her demanding residency.
Split into simpler sentences: After deciding that she cannot look after her baby, she leaves Chicago, abandoning Susie on a flustered and overworked Susan. She struggles to be a good mother to the child while completing her demanding residency.