By Sentence structures, Semicolons

.1-- No, I don't see that by is necessary.2-- Style guides can vary somewhat, but according to mine, namely, that is, for example, i.e. and e.g. are all followed by a comma and preceded by some kind of punctuation (comma, semicolon, parenthesis, etc.) depending on the sentence structure.

Hi, You said that you think the sentence is correct but at the same time, you definitely think the sentence needs a semicolon. I saw the kind of sentence structure with no employment of semicolons but instead employing commas to serve the writer's prpose. Let me get it straight. Do you think...