Final answer:
Piet De Jong was responsible for the third phase of conservation at Knossos from 1922 to 1952, reconstructing walls and rooms to shape the current appearance of the site.
Step-by-step explanation:
The third contribution of conservation work towards the Vijayanagara temple architecture is attributed to Piet De Jong. He conducted the third phase of restoration from 1922 to 1952. The extensive work included re-constructing walls and rooms which define the current appearance of Knossos.
The efforts by Piet De Jong have shaped much of what the site looks like today, with large sections of the palace featuring passages and quarters that had been eroded by time.