A simple sentence is a sentence that consists of only one independent clause and expresses a complete thought. There are various synonyms for simple sentence, such as a basic sentence, a plain sentence, a straightforward sentence, a clear sentence, and a concise sentence. These synonyms refer to the simple structure of the sentence with no complex grammatical constructions or clauses. A simple sentence can be useful in both spoken and written communication as it makes it easier for the audience to understand the intended message. Using simple sentences also helps to avoid confusion and misunderstanding, especially when communicating with people who are not familiar with the language.