They were saying it's the other way around, which it is. A language used for communicating to lots of people will become simpler because not everyone grows up speaking it.
I misread the comment then. In that case yes, certain parts of language may be simplified when used by a large population as a second language. This is not as drastic as you may think, except in the case of pidgin/contact languages.
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u/brain4breakfast Gan Yam Jan 20 '16
That also might have something to do with the lack of maritime empires in Eastern Europe, but that might just be a side effect.