Complex sentence: It had actually long been debated whether Neanderthals were hunters or scavengers, but the discovery of the pre-Neanderthal Schöningen wooden spears in Germany helped settle the debate in favour of hunting.
Split into simpler sentences: It had actually long been debated whether Neanderthals were hunters or scavengers. The discovery of the pre-Neanderthal Schöningen wooden spears in Germany helped settle the debate in favour of hunting.