"Deshawn turned his research project in a week early" is a Simple Sentence.
Explanation:
Each simple sentence comprises a subject and a verb. A simple sentence always expresses things about a single action. In other words, it has only one independent (main) clause and no dependent clauses.
A complete sentence that states about a single action known as an independent clause. Whereas an incomplete sentence that requires an independent clause to get its sentence to get completed is known as a dependent clause.
Compound, complex and Compound-complex are the sentence types that use the dependent clause.
