Complex sentence: The crash into the sea was caused by pilot error during approach to runway 07R; the pilots were so occupied with the nose gear light not turning green that they lost their situation awareness and failed to keep track of their altitude.
Split into simpler sentences: The crash into the sea was caused by pilot error during approach to runway 07R. The pilots were so occupied with the nose gear light not turning green that they lost their situation awareness and failed to keep track of their altitude.