Complex sentence: The "Dreamcast Gun" is a light gun that was made specifically for the Sega Dreamcast; however, it was released only in Europe and Asia, where it is the official light gun for use.
Split into simpler sentences: The "Dreamcast Gun" is a light gun that was made specifically for the Sega Dreamcast. However, it was released only in Europe and Asia, where it is the official light gun for use.