Complex sentence: As of December 2012, approximately 324,000 people worldwide had cochlear implants surgically implanted; in the U.S., roughly 58,000 adults and 38,000 children had been recipients.
Split into simpler sentences: As of December 2012, approximately 324,000 people worldwide had cochlear implants surgically implanted. In the U.S., roughly 58,000 adults and 38,000 children had been recipients.