This one: "Lee noticed a problem and alerts a teacher".
The second verb should not have been changed to present tense.
You should change the verb alert to past tense: "Lee noticed a problem and alerted a teacher".
<span>unfortunately, long after his death
"unfortunately" implies the author's viewpoint on a negative connotative scale.</span>
I mean it can be if you're thinking of it as a sociology as it would lead the person to believe that that have a lot of power over everything. Also it can be bad because of taxes
