Data: W. John Kenney SECRETARY_SERVED_UNDER James Vincent Forrestal; NAME W. John Kenney; W. John Kenney LEFT_OFFICE September 19, 1947; Assistant Secretary of the Navy

What would a sentence about this data be like?
W. John Kenney served as Assistant Secretary of the Navy for Secretary of the Navy James Vincent Forrestal until Kenney leave office on September 19, 1947.