Semicolon between sentences joined by a coordinating conjunction
Is separating two coordinating-conjunction-linked sentences, the former having a comma(s), with a semicolon instead of a comma logically justified?
In GrammarBook.com’s Semicolons category, Rule 5. reads:
Use the semicolon between two sentences joined by a coordinating conjunction when one or more commas appear in the first sentence.
Examples: When I finish here, I will be glad to help you; and that is a promise I will keep.
If she can, she will attempt that feat; and if her husband is able, he will be there to see her.