Complex sentence: The new rendering infrastructure improves several shortcomings of the old design, including removing internal locks and adding proper support for offscreen rendering, so that compositing and XVideo/OpenGL applications are properly managed.
Split into simpler sentences: The new rendering infrastructure improves several shortcomings of the old design. Among its significant improvements: the lack of internal locks and proper support for offscreen rendering, so that compositing and XVideo/OpenGL applications are properly managed.