Language is a complex tapestry. 是什麼意思

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the only complicated word in this sentence is Tapestry.
Tapestry means a fabric or large cloth which is hand woven with heavy work of long hours and is purely handmade to make it beautiful and rich in its texture.
the sentence here is Language is a complex Tapestry which means -
any language is a work of culture, heritage and history of the country/region/state. It is beautiful, as it is made by the people from long ago and that is why it is so large and huge which makes it complex as many people have been working on it ages after ages.
This sentence is a reference to explain that a language is complex because it has not been just made yet, but from very long and has contribution of people from diverse backgrounds to built it as strong as it is now.
hope this helps :)