Complex sentence: These Marvis survive today, and were listed as "Iranis/Iranians" in Soviet censuses through the 1980s, and locate them in Samarkand as well as Bukhara and the area in between on the Zarafshan river.
Split into simpler sentences: These Marvis survive today--and were listed as "Iranis/Iranians" in Soviet censuses through the 1980s. They are found now in Samarkand as well as Bukhara and the area in between on the Zarafshan river.