Complex sentence: He leaves the KGB and when the commercial aircraft he was supposed to be on crashed without survivors he sees his chance to begin a new life in the United States and skillfully constructs a new identity as a small town newspaper editor complete with a pregnant wife.
Split into simpler sentences: He leaves the KGB when the commercial aircraft he was supposed to be on crashed without survivors. He sees his chance to begin a new life in the United States and skillfully constructs a new identity as a small town newspaper editor complete with a pregnant wife.