Gerund + "while"

Does this sentence make sense?
Please could you tell me if you think this sentence makes sense. I dont know how to use the gerondif, if I have to write "while" or not before?

Thanks!!!

Rebuilding a new environmental multilateralism at Poznan and right after the President-elect Obama’s Energy and Environment Team announcement, Ban Ki-Moon pledges for a new cooperation UN/US against Climate Change.

The sentence makes no sense, and appears to be an example of a "dangling participle." As worded, it says that Ban Ki-Moon is making a pledge while he is simultaneously in the process of "rebuilding multilateralism".

Notice that
1) There is no word "gerondif" in English; there is, however, a word "gerundive".
2) The English language has gerunds, but it does not have gerundives.

OK but can I use the gerund even if I am not using the present. For instance my sentence would be Ban Ki-Moon pledges for a new cooperation UN/US against Climate Change while the parties to the UNFCC convened in Poznan and President-elect Obama announced his Energy and Environment Team.

Does is makes sense even if everything is not "happening at the same time" ?

(This is about the original sentence. I hadn't seen your revision when I wrote it.)

I think I could understand a simplified version of the original sentence, with a couple of changes:However, I would reverse the order:The temporal clause: "right after the President-elect Obama’s Energy and Environment Team announcement" is awkward joined with the *participial phrase (=gerund phrase) by and. You could move it to the end of the sentence:This is still a lot of information to pack into one sentence. As a stylistic matter, I would be inclined to simplify it or break it into two sentences.

* I call an -ing verb a participle when it acts as an adjective as it does here, describing Ban Ki-Mon. Other people refer to all such verbs as gerunds. Perhaps that is the system you are being taught.

fle said:

OK but can I use the gerund even if I am not using the present.

You seem to misunderstand what a "gerund" is in English. In English, a gerund is a present participle used as a noun:

The reviewer said he enjoyed the singing of the female lead, but the dancing by the chorus was not very good.

For instance my sentence would be Ban Ki-Moon pledges for a new cooperation UN/US against Climate Change while the parties to the UNFCC convened in Poznan and President-elect Obama announced his Energy and Environment Team.

Does is makes sense even if everything is not "happening at the same time" ?

I think what you are really asking about is .

Having said farewell to Marie Antoinette, Louis XVI went to the guillotine.

Knowing how much you like chocolate, I made a chocolate cake for tonight's dessert.

I will go to the beach tomorrow and I will watch the children playing in the sand.