Complex sentence: The quality of the full motion video (while still grainy due to the hardware limitations of the Mega-CD) was a noticeable improvement over older full motion video games; however, the game never won the popularity that other full motion video games did in the 1990s.
Split into simpler sentences: The quality of the full motion video (while still grainy due to the hardware limitations of the Sega CD) was a noticeable improvement over older full motion video games. Yet, the game never won the popularity that other full motion video games did in the 1990s.