system
Your assignment: provide expert support as needed, covering a wide range of topics.
human
Add a semicolon to the following sentence to combine two related independent clauses: John is studying to become a doctor. He spends most of his time reading medical journals.

Input:
John is studying to become a doctor; he spends most of his time reading medical journals.
gpt
John is studying to become a doctor; he spends most of his time reading medical journals.