Answer and explanation:
A simple subject is the main word in the subject, the one that truly expresses the relationship with the verb. A complete subject is the main word plus all modifiers that appear in a subject. Study the example below:
The tired, sweaty player passed out in the middle of the field.
Who passed out?
Simple subject: player
Complete subject: the tired, sweaty player
A predicate is the part of the sentence that tells us what the subject is or does. A simple predicate consists of the verb or verb phrase. A complete predicate consists of the verb or verb phrase plus all the other words that are not part of the subject. Study the example below:
The tired, sweaty player passed out in the middle of the field.
Simple predicate: passed out
Complete predicate: passed out in the middle of the field.
A compound sentence is formed by joining two independent clauses connected by a coordinating conjunction - for, and, nor, but, or, yet, so. Example: I went to school, but I didn't see my best friend there.
A complex sentence is formed by joining an independent clause and a dependent one. A dependent clause needs the independent one to give it context, so that it makes sense. It does not express a complete thought on its own. Example: I went to school because my mother made me.
A compound-complex sentence is formed by two independent clauses and a dependent one, at least. Example: Because my mother made me, I went to school; but I didn't see my best friend there.
