Complex sentence: As his choices run short, President Livingston is notified of a secret straw vote that Congress will conduct before the actual impeachment vote: if the resolution against him passes, he will order the US Armed Forces into full war footing against Russia.
Split into simpler sentences: As his choices run short, President Livingston is notified of a secret straw vote that Congress will conduct before his impeachment. If the resolution passes, he will order the US Armed Forces into full war footing against Russia.