Complex sentence: Most modern US doctrine is based around the concept of full spectrum operations, which combine offensive, defensive, and stability or civil support operations simultaneously as part of an interdependent joint or combined force to seize, retain, and exploit the initiative.
Split into simpler sentences: Most modern US doctrine is based around the concept of full spectrum operations. Full spectrum operations combine offensive, defensive, and stability or civil support operations simultaneously as part of an interdependent joint or combined force to seize, retain, and exploit the initiative.