To write a good essay, it is not enough to summarize what you have read. An essay should have a point of view. It should try to convince the reader of something. This "something" (the point you are trying to argue) is called the "thesis" of the essay. Once you have a thesis, it becomes easy to write the essay: the entire essay an effort to convince the reader of the thesis. Don't include anything in your essay that fails to contribute toward this goal.
In On Writing Well, William Zinsser commented that
Here is Henry Fowler's diagnosis of the problem, from Modern English Usage:Clutter is the disease of American writing. We are a society strangling in unnecessary words, circular constructions, pompous frills and meaningless jargon.
abstractitis The effect of this disease, now endemic on both sides of the Atlantic, is to make the patient write such sentences as Participation by the men in control of the industry is non-existent instead of The men have no part in control of the industry; Early expectation of a vacancy is indicated by the firm instead of The firm say they expect to have a vacancy soon; The availability of this material is diminishing instead of This material is getting scarcer; A cessation of dredging has taken place instead of Dredging has stopped; Was this the realization of an anticipated liability? instead of Did you expect you would have to do this? And so on, with an abstract word always in command as the subject of the sentence. Persons and what they do, things and what is done to them, are put in the background, and we can only peer at them through a glass darkly. It may no doubt be said that in these examples the meaning is clear enough; but the danger is that, once the disease gets a hold, it sets up a chain reaction. A writer uses abstract words because his thought are cloudy; the habit of using them clouds his thoughts still further; he may end up by concealing his meaning not only from his readers but also from himself, and writing such sentences as The actualization of the motivation of the forces must to a great extent be a matter of personal angularity.
sociologese Sociology is a new science concerning itself not with esoteric matters outside the comprehension of the layman, as the older sciences do, but with the ordinary affairs of ordinary people. This seems to engender in those who write about it a feeling that the lack of any abstruseness in their subject demands a compensatory abstruseness in their language. Thus, in the field of industrial relations, what the ordinary man would call an informal talk may be described as a relatively unstructured conversational interaction, and its purpose may be said to be to build, so to speak, within the mass of demand and need, a framework of limitation recognized by both worker and client. This seems to mean that the client must be persuaded that, beyond a certain point, he can only rely on what used to be called self-help; but that would not sound a bit scientific.
There are of course writers on sociological subjects who express themselves clearly and simply; that makes it the more deplorable that such books are often written in a jargon which one is almost tempted to believe is deliberately employed for the purpose of making what is simple appear complicated, exhibiting in an extreme form the common vice (see abstractitis) of preferring pretentious abstract words to simple concrete ones.
Sociologese, I should add, afflicts many sciences in addition to sociology.