Given the following sentence, edit it for clarity and succinctness.
Due to the fact that he was unable to find the solution to his problem, he became very discouraged.
As he couldn't solve his problem, he became discouraged.
Complete the following task based on the instruction and optional input provided.### Instruction:
Given the following sentence, edit it for clarity and succinctness.

### Input:
Due to the fact that he was unable to find the solution to his problem, he became very discouraged.

### Output:
As he couldn't solve his problem, he became discouraged.