Model a complex sentence, with "although" and a noun clause.
"Although it's difficult to believe, the fact that she finished her project in just one night is beyond impressive."
Complete the following task based on the instruction and optional input provided.### Instruction:
Model a complex sentence, with "although" and a noun clause.

### Output:
"Although it's difficult to believe, the fact that she finished her project in just one night is beyond impressive."