I noticed there seemed to be unnecessary use of jargon in the abstract. I asked ChatGPT to rewrite it in plain English and I think it did a pretty good job:
The sharp-edged stone flakes and flaked pieces that our ancestors intentionally made are important evidence of the development of technology in our lineage. This evidence helps us understand how early humans behaved, thought, and survived. In this study, we talk about a large collection of sharp-edged stones found near areas where long-tailed macaques were foraging for food. These stones are almost identical to the ones early humans made, which suggests that the macaques unintentionally produced them while searching for food. When we compare these stones to ones made by early humans millions of years ago, we find that they are very similar. If we didn't know that the macaques made these stones accidentally, we might think that they were made by early humans.
The sharp-edged stone flakes and flaked pieces that our ancestors intentionally made are important evidence of the development of technology in our lineage. This evidence helps us understand how early humans behaved, thought, and survived. In this study, we talk about a large collection of sharp-edged stones found near areas where long-tailed macaques were foraging for food. These stones are almost identical to the ones early humans made, which suggests that the macaques unintentionally produced them while searching for food. When we compare these stones to ones made by early humans millions of years ago, we find that they are very similar. If we didn't know that the macaques made these stones accidentally, we might think that they were made by early humans.