advance a convincing theory

sb70012

Senior Member
Azerbaijani/Persian
No one has advanced a convincing theory explaining the beginnings of writing.

Source: 504 Essential words by Murray Bromberg

Hi,
I know the meanings of each word in the blue part but I can't understand it as a whole. Would you please clarify this sentence to me? What's the whole meaning? What does the whole sentence want to tell us?

Thank you.
 
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