Complex sentence: On retiring from the Army in 2005, Lewis was appointed to the position of First Assistant Secretary of the National Security Division in the Department of the Prime Minister and Cabinet, and in December 2008, was appointed as National Security Adviser to the Rudd Labor Government.
Split into simpler sentences: On retiring from the Army in 2005, Lewis was appointed to the position of First Assistant Secretary of the National Security Division in the Department of the Prime Minister and Cabinet. In December 2008, was appointed as National Security Adviser to the Rudd Labor Government.