Complex sentence: The video encoder used in the system still supports S-Video and RGB, but these outputs were left unconnected and many users who wished for a better picture resorted to modifying the system to restore this missing functunality.
Split into simpler sentences: The video encoder chip used in the system still supports S-Video and RGB, but these outputs were left unused. Many users who wished for better picture resorted to modifying the system to restore this missing functunality.