by Whit Garner Sun Mar 06, 2022 10:56 pm
Just to be clear, comma + "and" has several uses - not just connecting two sentences. For example, we use a ", and" with a 3 or more item list:
She voted to increase the student lunch allowance, improve access to free breakfasts, and provide free tutors for students struggling with common core subjects.
We can also see ", and" when we have a 2-item list that has a modifier between the two items:
The new project will demolish the old building, which has been declared uninhabitable, and replace it with a new park.
The list is "will demolish and replace," but since the descriptor "which..." comes in the middle, it gets a comma before and after.
Finally is the example you're offering, where ", and" is being used to connect two independent clauses. In this case, "and" is a connecting conjunction. The only rule is that the clauses before and after the ", and" must be able to stand alone (independent), and they must be closely related. One doesn't need to cause or be the result of the other. Think of a ", and" as a semi-color or a period.
"My sister loves to cook, and she always hosts holiday dinners."
These two things are related, but the second isn't necessarily a "result" of the first.
As for your two examples - the first about JD would NOT be okay. The two must be strongly related. Your second example is perfect though!
Hope this helps!
"A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing." - George Bernard Shaw