What type of sentence is "my brother cut the grass on saturday"

My brother cut the grass on Saturday.

It is a simple sentence since it contains a subject (My brother) and a verb (cut). It also has a direct object (the grass) and a prepositional phrase of time (on Saturday). It is important to state that a sentence must have a complete idea and stands on its own. That's why this type of sentence is called independent clause.

the audience knows that nora is intentionally failing to dance correctly, but helmer doesnt