Complex sentence: During World War II, when Bankstown Airport was established as a key strategic air base to support the war effort, the specially constructed bunker became an important Royal Australian Air Force control point and headquarters from 1945 until it was closed in 1947.
Split into simpler sentences: During World War II, Bankstown Airport was established as a key strategic air base to support the war effort. The specially constructed bunker became an important Royal Australian Air Force control point and headquarters from 1945 until it was closed in 1947.