Complex sentence: The tools were found to have traces of horse and cameloid protein, which were dated to 13,000 to 13,500 YBP, a date confirmed by sediment layers in which the tools were found and the types of protein residues found on the artifacts.
Split into simpler sentences: The tools were found to have traces of horse and cameloid protein. They were dated to 13,000 to 13,500 YBP, a date confirmed by sediment layers in which the tools were found and the types of protein residues found on the artifacts.