Given a text, write a compressed version of it in a single sentence.

This assessment is based on an extensive review of FBI files and interviews with agents and supervisors at FBI Headquarters and various field offices.
This assessment is based on an extensive review of FBI files and interviews.

But natural games are not quite so straightforward. I begin by mentioning again the rather surprising no-free-lunch theorem proved by Bill Macready and David Wolpert as postdoctoral fellows at the Santa Fe Institute a few years ago.
Natural games aren't so straightforward plus the surprising no-free-lunch theorem proved by Bill Macready & David Wolpert, at Santa Fe Institute a few years ago.

An Egyptian Islamic Jihad (EIJ) operative told an [-] service at the same time that Bin Ladin was planning to exploit the operative's access to the US to mount a terrorist strike.

An Egyptian Islamic Jihad operative said at the same time that Bin Ladin was planning to exploit the operative's access and strike.

