Complex sentence: Dr. Richard Ferber is the director of The Center for Pediatric Sleep Disorders, at Children's Hospital in Boston; he is best known for his methods that let young infants learn how to fall asleep on their own.
Split into simpler sentences: Dr. Richard Ferber is the director of The Center for Pediatric Sleep Disorders, at Children's Hospital in Boston. He is best known for his methods that let young infants learn how to fall asleep on their own.