Complex sentence: Gina was the first wife to ever walk off of the set due to the things the man said about her young, adopted son with Down Syndrome, calling him "a defect," as well as other behaviors Loudon deemed abusive toward her.
Split into simpler sentences: Gina was the first wife to ever walk off of the set. She did so due to the things the man said about her young, adopted son with Down Syndrome, calling him "a defect," as well as other behaviors Loudon deemed abusive toward her.