Simplify the following text for a Grade 9 native English-speaking person.
Original: However , a hominid skull discovered in Chad in 2001 , classified as Sahelanthropus tchadensis , is approximately seven million years old , and may be evidence of an earlier divergence .
Simplified: In 2001 , a hominid skull was discovered in Chad . The skull is about 7 million years old , and has been classified as Sahelanthropus tchadensis .