Complex sentence: This chipset outperformed the older RIVA TNT while costing less to produce, and proved extremely popular in the OEM market, as most consumers simply assumed all TNT2 cards were the same.
Split into simpler sentences: This chipset outperformed the older RIVA TNT while being less costly to produce. They proved quite popular in the OEM market, as most consumers simply assumed all TNT2 cards were the same.