Complex sentence: IGN gave the game a score of 7.8 out of 10; however, GameSpot rated the game (7.3 out of 10), much lower than it rated its expansion (8.6 out of 10).
Split into simpler sentences: IGN gave the game a score of 7.8 out of 10. However, GameSpot rated the game (7.3 out of 10) much lower than it rated its expansion (8.6 out of 10).