Complex sentence: Another result of lengthy prior clandestine service is that the agent may be hard to control in most operations the case officer's superior training and experience give him so decided an edge over the agent that recognition of this superiority makes the agent more tractable.
Split into simpler sentences: Another result of lengthy prior clandestine service is that the agent may be hard to control. In most operations the case officer's superior training and experience give him so decided an edge over the agent that recognition of this superiority makes the agent more tractable.