Complex sentence: It was promoted in an advertising campaign featuring pediatrician and child development expert Dr. T. Berry Brazelton, who said to let the child decide when the time is right to potty train.
Split into simpler sentences: It was promoted in an advertising campaign featuring pediatrician and child development expert Dr. T. Berry Brazelton. Dr. Brazelton said to let the child decide when the time is right to potty train.