Complex sentence: To operate the machines and free the Doldreks, ThermaGems will be needed, but the wall between the wall and the ThermaGems are so small that even Laptrap cannot enter.
Split into simpler sentences: To operate the machines and free the Doldreks, ThermaGems will be needed. But the wall between the wall and the ThermaGems are so small that evan Laptrap cannot enter.