Complex sentence: Huge fossil beds made of the bones of hundreds or thousands of individuals suggest that many of the larger brontothere species, and some prehistoric rhinoceroses, such as "Diceratherium" were also social animals which organized themselves into herds.
Split into simpler sentences: Huge fossil beds made of the bones of hundreds or thousands of individuals suggest that many of the larger brontothere species. Some prehistoric rhinoceroses, such as "Diceratherium", were also social animals which organized themselves into herds.