Complex sentence: For McGee has been working in the Cybercrime Unit basement on Director Vance's orders, and he and Ziva are the only members of Gibbs' trio who have been reunited and returned to their normal posts at the Washington, D.C Naval Yard office.
Split into simpler sentences: For McGee has been working in the Cybercrime Unit sub-basement on Director Vance's orders. He and Ziva are the only members of Gibbs' trio who have been reunited and returned to their normal posts at the Washington, D.C Naval Yard office.