A simple sentence has only one subject and one predicate. The subject denotes the person or thing about which something is said. The predicate includes the verb that describes what the subject is doing. Here are some examples of simple sentences.
Subject / Predicate
Birds of the same feather /flock together.
Money /is the root of all evil.
The Queen of Sheba /went to see King Solomon.
The subject may consist of one word or several words. In the same way, the predicate may consist of one word or several words. The subject must have a noun or pronoun in it and the predicate must have a verb in it.