Is this subject singular or plural?

Question

I have a simple thing, but it confused me.

The nature of convergences of topological relations of segment adjacencies can be derived from graphs.

I want to know whether the subject of the above sentence is singular or plural, as I am now confused and feeling it might be plural. Any comments?

Answer 1

It's singular. The subject is one fairly large noun phrase, the nature of convergences of topological relations of segment adjacencies, but don't be fooled by all the extra words: the head of this noun phrase is the noun nature, and since nature is singular, so is the entire noun phrase.