Final answer:
The correct sentences are punctuated properly by using parentheses and commas.
Step-by-step explanation:
The correct sentences with proper punctuation are:
- Tyler (who loves learning about the past) is reading a book about a.
- Tyler, who loves learning about the past, is reading a book about an.
In the first option, the parentheses are used to provide additional information about the subject, which is a correct use of punctuation. In the second option, the commas are used to set off the nonessential phrase 'who loves learning about the past,' which is also correct.
Learn more about Punctuation in English sentences