Complex sentence: Sontag & Drew, page 586 During the cold war, this kind of submarine surveillance was known as "Operation Holy Stone"; submariners nicknamed the program "Operation Pinnacle" or "Bollard".
Split into simpler sentences: Sontag & Drew, page 586 During the cold war, this kind of submarine surveillance was known as "Operation Holy Stone". Submariners nicknamed this program "Operation Pinnacle" or "Bollard".