Complex sentence: Capt. McWethy later became involved in the early development of SOSUS, the underwater listening posts arrayed around the world that track naval and maritime traffic, and support anti-submarine warfare command and tactical forces by detecting, classifying, and tracking submarine activity.
Split into simpler sentences: Capt. McWethy later became involved in the early development of SOSUS, the underwater listening posts arrayed around the world that track naval and maritime traffic. In particular, the SOSUS sensors support the anti-submarine warfare command and tactical forces by detecting, classifying, and tracking submarine activity.