Complex sentence: Roughly coinciding with the time period of the Homo sapiens introduction to Europe and decline of the Neanderthals, individual skulls and/or long bones begin appearing heavily stained with red ochre and are separately buried.
Split into simpler sentences: Roughly coinciding with the time period of the Homo sapiens introduction to Europe and decline of the Neanderthals. Individual skulls and/or long bones begin appearing heavily stained with red ochre and are separately buried.