I had never heard that before. Do you have a source for this claim?
Arabic, Aramaic, and Hebrew all belong to the Semitic family of languages and all likely share origins with an early, proto-semitic language. But I have never heard anyone say that Aramaic "changed [in]to Arabic."
Aramaic never changed into anything. A lot of people still speak Aramaic. A good example would be in Ma'loula, Syria. However, Aramaic was the predominant language in the northern Middle East, especially in the Levant region that make up the modern day countries of Syria, Lebanon, Israel, Jordan, and the Palestinian territories. After the Arab/Muslim invasion of the Levant, Aramaic was replaced by Arabic. Just like how the Coptic language in Egypt was replaced by Arabic.
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