Complex sentence: The combination of effects means that the hydrogen aircraft have low range, although the higher specific energy helps reduce the deficit as it halves the specific fuel consumption It turns out that most hydrogen aircraft designs are very big, both in length and diameter.
Split into simpler sentences: The combination of effects means that the hydrogen aircraft have low range, although the higher specific energy helps reduce the deficit as it halves the specific fuel consumption. Nevertheless, it turns out that most hydrogen aircraft designs are very big, both in length and diameter.