Complex sentence: The second-generation NES also used a card slot reader, and featured no 10NES lock-out chip; however, unlike the top-loading NES 2, the FC Twin is completely compatible with the Galoob Game Genie without the use of an adaptor.
Split into simpler sentences: The second-generation NES also used a card slot reader, and featured no 10NES lock-out chip. However, unlike the top-loading NES 2, the FC Twin is completely compatible with the Galoob Game Genie without the use of an adaptor.