A comma cannot be used to correct most run-on sentences
Usually the issue with run on sentences is that they use too many commas, instead of breaking the sentence into two sentences.
Hi !!
With the global warning, many species will become extinct.
In the Grand Canyon, there are some extinct volcanoes.
hope this helps☺☺☺
Answer:
Her language changes; she doesn't speak proper English around the other church members because she doesn't want to appear superior or better than them.