Complex sentence: In 1972, Maxwell's 15-year-old son arrived home from school and found her dead at the age of 50 of an apparent heart attack, after she had been treated for hypertension and pulmonary disease.
Split into simpler sentences: In 1972, at age 50, Maxwell was found dead in her home by her 15-year-old son, who had arrived home from school. The cause was an apparent heart attack; she had been treated for hypertension and pulmonary disease.