Simplify the following text for a Grade 9 native English-speaking person.
Original: Not long after in 1960 Louis , his son Philip and Ray Pickering discovered a fossil he termed `` Chellean Man '' , as it was in context with Olduwan tools , the first such find .
Simplified: In 1960 Louis , his son Philip and Ray Pickering discovered a fossil he termed `` Chellean Man '' , as it was in context with Oldowan tools , the first such find .