Change the second sentence to make the following two sentences compatible.
Tom is going on a trip with his friends. Mary is planning her vacation.
Tom is going on a trip with his friends. Mary, one of his friends, is planning her vacation.
Complete the following task based on the instruction and optional input provided.### Instruction:
Change the second sentence to make the following two sentences compatible.

### Input:
Tom is going on a trip with his friends. Mary is planning her vacation.

### Output:
Tom is going on a trip with his friends. Mary, one of his friends, is planning her vacation.