Complex sentence: Within a few days of arriving at Children's Hospital Genie started learning to dress herself and began voluntarily using the toilet, but she continued to have nightly episodes of nocturnal enuresis and daytime incontinence remained an ongoing problem for her.
Split into simpler sentences: Within a few days of arriving at Children's Hospital, Genie started learning to dress herself and began voluntarily using the toilet. Despite this, she continued to have nightly episodes of nocturnal enuresis and daytime incontinence remained an ongoing problem for her.