Complex sentence: A flagpole flying the Australian flag was installed on the staircase landing, to mark most controversial of all was the extensive work needed to transform the dark varnished Tasmanian mountain ash paneling of the walls of all three rooms.
Split into simpler sentences: A flagpole flying the Australian flag was installed on the staircase landing. Most controversial of all was the extensive work needed to transform the dark varnished Tasmanian mountain ash panelling of the walls of all three rooms.