MMacD is correct that some of the language sounds "formal" but I think mistaken to suggest people who talk this way are "putting on airs".
A native speaker might use these structures in academic writing, which is naturally fairly formal. Moreover, academics might write this way because it mirrors their train of thought -- in other words, they are writing as they think something through, and then force the grammar to fit their thought, rather than rewriting the entire sentence.
This is more common when speaking than writing, since you can't revise a speech or a lecture. But it also indicates what is important to the speaker, and how they derive or deduce some conclusion, with the way they structure their argument.
For example, suppose I'm talking about butterflies and moths in an academic setting:
When speaking of the Order Lepidoptera, the taxonomy is not as structured as many would like, since of the two groups that comprise the order, the butterfly is that which is monophyletic, while the moths have a more diverse phylogeny.
Of course there are shorter and more direct ways to phrase, this. But also keep in mind that some academic speakers, although undeniably intelligent, might not care if their sentences are clear and concise. Their audience should still be able to follow along and understand their meaning.