Complex sentence: The Raymonden cave contained a multitude of stone and bone artefacts from the Magdalenian including numerous art works' such as the "bison plate" (in French "plaquette au bison").
Split into simpler sentences: The Raymonden cave contained a multitude of stone and bone artefacts from the Magdalenian including a lot of art work. Renouned, for instance, is the "bison plate" (in French "plaquette au bison").