Complex sentence: Some accounts indicate that archaeologists found the first fibers of silk in Thailand to be over 3,000 years old in the ruins of Baan Chiang, the site is considered by many to be Southeast Asia's oldest civilization.
Split into simpler sentences: Some accounts indicate that archaeologists found the first fibers of silk in Thailand to be over 3,000 years old in the ruins of Baan Chiang. The site is considered by many to be Southeast Asia's oldest civilization.