Compound Sentence

. A compound sentence has two or Independent clause sentences. The independent clauses can be joined by a coordinating sentences (such as "and," "for" and "but") or a semicolon. A simple sentence consists of only one clause. A compound sentence consists of two or more independent clauses. A complex sentence has at least one independent clause plus at least one dependent clause. A set of words with no independent clause may be an incomplete sentence, also called a sentence fragment. A sentence consisting of one or more dependent clauses plus two or more independent clauses may be called a complex-compound sentence or compound-complex sentence

Examples :

1	simple sentence	I like pumpkin pie.
2	compound	I don't know how to bake, so I buy my sweets.
3	complex	I enjoyed the apple pie that you bought for me.
4	compound-complex (also known as complex-compound)	The dog lived in the garden, but the cat, who was smarter, lived inside the house.
5	sentence fragment	What a silly dog.

The simple sentence in example 1 contains one clause.

Example two has two clauses (I don't know how to bake and I buy my sweets), combined into a single sentence with the coordinating conjunction so.

 In example 3, I enjoyed the apple pie is an independent clause, and that you bought for me is a dependent clause; the sentence is thus complex.

 In sentence 4, The dog lived in the garden and the cat lived inside the house are both independent clauses; who was smarter is a dependent clause.

Example 5 features a noun phrase but no verb. It is not a grammatically complete clause.