If it's confusing - chances are that it's incorrect. So, no the sentence is not correct. First decide what you want to say - then try to say it the simplest way possible.
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FizziHow about this?There - much better!
"Inter-country analysis of the product manual indicated that significantly less information was provided by companies in country 1 than in country 2 and 3 respectively"
FizziHow about this?I don't find "inter-country analysis" to be a very meaningful phrase, and in any case, you compare the results by country in the main sentence, so i
"Inter-country analysis of the product manual indicated that most information was significantly less provided by companies in country 1 than in country 2 and 3 respectively"