What is the definition of a simple sentence?

A simple sentence is best defined as having one subject and one finite verb, and it may include an object. This structure allows the sentence to express a complete thought in a straightforward manner, without the complexity that comes from additional clauses. A simple sentence achieves clarity and directness, making it the most basic unit of expression in English grammar.

In the context of the other options: the first choice describes a compound sentence, which involves two or more independent clauses typically connected by conjunctions. The second option refers to a complex sentence that is marked by the combination of a main clause with one or more subordinate clauses, adding layers of meaning. The fourth choice suggests a mix of compound and complex structures, which is not applicable to the definition of a simple sentence since it focuses on a singular grammatical approach.