Complex sentence: He is well-known for his work on "Dateline NBC", in particular the controversial former segment known as "To Catch a Predator", which revolved around catching potential Internet sex predators using a sting operation.
Split into simpler sentences: He is well-known for his work on the "Dateline NBC" television segment "To Catch a Predator". These investigations revolved around catching potential Internet sex predators using a sting operation.