How To Write A Conclusion To A Theme Paper . Demonstrate the importance of your ideas. Typically, one sentence can be enough to restate the topic clearly, and you will want to explain why your topic is important. Conclusion How to write an essay LibGuides at University of from libguides.newcastle.edu.au Essentially, this sentence completes a paragraph while restating the main argument or idea. It gives a clear overview of the essay or research topic. The middle section of your conclusion should be three to five sentences long.