Complex sentence: All ZonePerfect meals are based on the ratio 40:30:30-in other words, the food they market is 40% carbohydrates, 30% protein and 30% fat.
Split into simpler sentences: All ZonePerfect meals are based on the ratio 40:30:30. So the food they market is 40% carbohydrates, 30% protein and 30% fat.