Edit this sentence to make it more concise: 

The employee that was assigned to the project had excessive difficulty understanding the problem.
The employee assigned to the project had difficulty understanding the problem.
The employee struggled to understand the project problem.
Complete the following task based on the instruction and optional input provided.### Instruction:
Edit this sentence to make it more concise: 

The employee that was assigned to the project had excessive difficulty understanding the problem.

### Input:
The employee assigned to the project had difficulty understanding the problem.

### Output:
The employee struggled to understand the project problem.