Original sentence: The Nintendo DS (which is short for Dual Screen, although Nintendo has also promotionally said it to be short for Developer's System, due to their claim of the "sheer joy" of developing games for the handheld), is a dual-screen portable handheld game console developed and manufactured by Nintendo
Edited sentence: The Nintendo DS (which is short for Dual Screen, although Nintendo has also promotionally said it to be short for Developer's System, due to the sheer joy of developing games for the handheld), is a dual-screen portable handheld game console developed and manufactured by Nintendo