Let's assume sentence below (which is From "The Official Cambridge Guide to IELTS").
Ants simply sense changes in their environment, as for example when the mound's wall has been damaged, altering the circulation of air.
By syntactic analysis of the sentence above we realize that the sentence is complete by reaching the word 'environment' therefore comma indicates an appositive. after the second comma we have an ING form of the verb which means a reduction transformation is occurred. as far as I know in syntactical analysis if an ING form of the verb appeared after punctuations reduction has occurred and it should be reconstructed using (While + NP + To be) so that NP is reconstructed from the independent clause.
In other words, by reconstructing the sentence we have:
Ants simply sense changes in their environment, as for example when the mound's wall has been damaged, while ants are altering the circulation of air.
But it doesn't make sense. Meanwhile, appositive with comma construction cannot contains a full sentence. therefore, we cannot reconstruct the last sentence from the appositive.
what is the correct reconstruction of this sentence?
I would be so much appreciate that if some body explain that.