Complex sentence: Meanwhile, back at CTU, Phillip "mourns" over the loss of Graem, and learns that Gredenko is in Los Angeles, he calls Liddy, head of security for BXJ, to murder Gredenko before CTU finds him.
Split into simpler sentences: Meanwhile, back at CTU, Phillip "mourns" over the loss of Graem, and learns that Gredenko is in Los Angeles. He calls Liddy, head of security for BXJ, directing him to murder Gredenko before CTU finds him.