Complex sentence: Most of this hills was covered with an iron age cemetery containing unique clay pottery findings.The excavations at Gheytarieh during 1968-69 by Seifollah Kambakhshfard revealed that city of Tehran was 3000 years old, which was an astonishing news to the Archaeological community at the time.
Split into simpler sentences: Most of this hills was covered with an iron age cemetery containing unique clay pottery findings.The excavations at the Gheytarieh were carried out by Seifollah Kambakhshfard in 1968 and 1969. As such the results revealed that city of Tehran was 3000 years old, which was an astonishing news to the Archaeological community at the time.