Sentence Correction (SC) | Re: Imported into Massachusetts from Europe in 1869, the gypsy moth was us

Thanks for your reply Shraddhaegmat

Your explanation did clear a few doubts in my head

But, I have the below two questions
1. What should follow / precede such verb phrases ? The noun / noun phrase it is modifying?
2. When we have construction such as "preposition +verbing" , do we consider them as verbing modifiers ? I have seen a GMATPrep example in which "preposition + verbing" are considered verbing modifiers.

Please correct me if I am wrong.