Complex sentence: The ONR S&T Program is organized into "thrusts", which are grouped into 23 research areas, including nanoelectronics, computational methods, underwater weaponry, and combat casualty care.
Split into simpler sentences: The ONR S&T Program is organized into what it terms "thrusts", which are grouped into 23 distinct research areas. Such areas include nanoelectronics, computational methods, underwater weaponry, and combat casualty care.