Complex sentence: The Pineview core adds an on die memory controller and graphics core, but uses the same Bonnell CPU core as the Diamondville-based Atom processors, which is why they are not much faster than their Diamondville predecessors.
Split into simpler sentences: The Pineview core has an on die memory controller and graphics core, but uses the same Bonnell CPU core as the Diamondville Atom. Thus, they are not much faster than their Diamondville predecessors.