You are given a sentence with an unclear pronoun. Rewrite the sentence to make it clear.
John sent a letter to him.
John sent a letter to another person.
Complete the following task based on the instruction and optional input provided.### Instruction:
You are given a sentence with an unclear pronoun. Rewrite the sentence to make it clear.

### Input:
John sent a letter to him.

### Output:
John sent a letter to another person.