Complex sentence: A hand axe is a bifacial Stone tool typical of the lower (Acheulean) and middle Palaeolithic (Mousterian), and is the longest-used tool of human history.
Split into simpler sentences: A hand axe is a bifacial Stone tool of the Lower and Middle Paleolithic. This kind of axe is typical of the lower Paleolithic (Acheulean) and the middle Palaeolithic (Mousterian) and is the longest-used tool of human history.