Complex sentence: The first archaeological record of what could be a prehistoric battle is at the 14,340-to 13,140-year old Mesolithic site known as Cemetery 117, located on the Nile near the Egypt-Sudan border.
Split into simpler sentences: The first archaeological record of what could be a prehistoric battle is at a Mesolithic site known as Cemetery 117. It was determined to be about 14,340 to 13,140 years old and located on the Nile near the Egypt-Sudan border.