The noun 'contestant' can be a simple subject or any other function of a noun; for example:
Subject of the sentence: The contestant won a prize. (simple subject)
Subject of a noun clause: The prize for the contestant who won is a thousand dollar gift certificate.
Object of the verb: We met the contestant who won the prize.
Object of the preposition: They presented a check to the winning contestant. (object of the preposition 'to')
The simple subject is "contestant."The word which stands for the 'doer' in the sentence without any modifiers or complements is the simple subject. In the sentence mentioned by you, "The tallest contestant won the prize", the word contestant is the simple subject and the words tallest contestant form a noun phrase representing the complete subject.
The tallest contestant won the prize.' In the preceding sentence, the simple subject is 'contestant.' The verb is 'won,' and the direct object is 'prize.'
A. Contestant.
contestantcontestant
b
b
B
The complete subject is "the tallest contestant."
A simple subject is a thing. If it were talking about a Baseball or a sentence the baseball is the simple subject.
The simple subject is "You" and the simple predicate is "waited."
a simple predicate is a verb and simple subject is a noun
The simple subject is "class," and the simple predicate is "have."