Complex sentence: Leila's parents, valuing a well-rounded education, believed that both she and her brother Steven should stay in the public school system, and Leila attended public middle and high school despite a very full schedule of music activities.
Split into simpler sentences: Leila's parents, valuing a well-rounded education, believed that both Leila and her brother Steven stay in the public school system. Jack and Wendy rejected home schooling, and Leila attended public middle and high school despite a very full schedule of music activities.