Final answer:
An effective sentence to add would explain the cognitive benefits of concise communication, such as better reader comprehension and memory retention, thus supporting the importance of omitting needless words.
Step-by-step explanation:
To expand the information presented in sentences 14, 15, and 16 which discuss efficient communication and clear writing, one may consider adding a sentence that describes the cognitive benefits of such practices. For instance, an additional sentence could explain how concise communication not only aids in retaining the reader's attention but also enhances the reader's ability to comprehend and remember information. This sentence would operate as a reason for the topic sentence's claim, supporting the idea that brevity can improve the efficacy of written communication.
In the context of the information gathered, the following sentence could be an effective addition: 'Adopting a concise writing style not only clarifies your message but also facilitates better cognitive processing, making the information more accessible and memorable for the reader.' This sentence complements the existing points by presenting evidence demonstrating the topic sentence's point, which is the importance of omitting needless words to enhance the reader's experience.