Complex sentence: Boston Children's Hospital overruled the family of a teenage patient who objected to the hospital's proposed changes contradictory to her medical diagnosis and treatment previously given by specialists at Tufts Medical Center and her other caregivers.
Split into simpler sentences: Boston Children's Hospital overruled the family of a teenage patient who objected to the hospital's proposed changes to her diagnosis and treatment. Treatment which was opposed to the medical diagnosis and treatment previously given by specialists at Tufts Medical Center and her other caregivers.