Complex sentence: The "niggun" he presented has been attributed to the Sadigurer Chasidim, who lived in what is now Ukraine, which uses the Phrygian dominant scale common in music of Transylvania.
Split into simpler sentences: The "niggun" is attributed to the Sadigurer Chasidim, who lived in what is now Ukraine. It uses the Phrygian dominant scale common in music of Transylvania.