The Nile river is the origin of the ancient Egyptian civilization that counts over 6 thousand years .
The Nile river is the origin of the ancient Egyptian civilization , which is over 6 thousand years old .
The Nile river is the origin of the ancient Egyptian civilization , which is over 6 thousand years old .
Make the sentence fluent: The Nile river is the origin of the ancient Egyptian civilization that counts over 6 thousand years . Output: