Complex sentence: Around a month into Genie's stay Butler said Genie had argued with her and used negatives in her protestations, which in addition to being the first report of Genie using negative forms in a sentence was also the first time anyone recorded Genie expressing disagreement in language.
Split into simpler sentences: Around a month into Genie's stay, Butler said Genie had argued with her and used negatives in her protestations. In addition to being the earliest that anyone reported Genie using negative forms in a sentence, it was also the first time Genie expressed disagreement in language.