Sentence structure errors include run-on sentences and sentence fragments (incomplete sentences). Here, Grammarly has identified a possible fragment:

The student has written the following:

Examine in depth what emotional intelligence is and the works of those that agree and disagree with the concept.

This sentence is a fragment, because it contains no subject (the verb is "examine," but who is doing the examining?). The student could correct the error by beginning the sentence,

I will examine in depth what emotion…

More information on run-on sentences and sentence fragments is available at Run-On Sentences & Sentence Fragments.