Complex sentence: The Oldowan, sometimes spelled Olduwan, is the archaeological term used to refer to the earliest stone tool industry in prehistory, being used during the Lower Paleolithic period, 2.6 million years ago up until 1.7 million years ago, by Hominines.
Split into simpler sentences: The Oldowan, sometimes spelled Olduwan, is the archaeological term used to refer to the earliest stone tool industry in prehistory. Oldowon tools were used during the Lower Paleolithic period, 2.6 million years ago up until 1.7 million years ago, by Hominines.