Complex sentence: There is still a Naval facility at Seneca Lake, the Naval Undersea Warfare Center (NUWC) Sonar test facility, where a scale model of the sonar section of the nuclear submarine USS Seawolf (SSN 21) was tested during the development of this ship.
Split into simpler sentences: There is still a Naval facility at Seneca Lake, the Naval Undersea Warfare Center (NUWC) Sonar test facility. Where a scale model of the sonar section of the nuclear submarine USS Seawolf (SSN 21) was tested during the development of this ship.