The sentence that requires semicolons instead of commas is:
"Miss Rachel will teach basic ballet movements such as a pirouette, or a spin, a jete, or a leap, and a reverence, or a bow, to her beginner-level classes."
This sentence contains multiple complex lists with additional details, which makes it necessary to use semicolons for clarity. The semicolons can help separate the distinct items in the list that already use commas.