Complex sentence: He claims that the original Hebrew/Aramaic word in the original lost Hebrew/Aramaic master copy (or verbal dictation) was Ahmed but it was not supposed to be translated to its meaning but should have been left as a person's name.
Split into simpler sentences: He claims that the original Hebrew/Aramaic word in the original lost Hebrew/Aramaic master copy (or verbal dictation) was "Ahmed". It was not supposed to be understood as a word, but should have been interpreted as a person's name.