Complex sentence: In the commonly available commercial format, one rice cake provides around 30 to 40 calories (8 grams carbohydrate); brown rice cakes are 70 calories, 16 grams carbohydrate.
Split into simpler sentences: In the commonly available commercial format, one rice cake provides around 30 to 40 calories (8 grams carbohydrate). However, brown rice cake is 70 calories, 16 grams carbohydrate.