A simple sentence consists of just one clause. Examples are given below.
In its simplest form, a simple sentence consists of a subject and a verb.
We can add more meaning to the sentence by including qualifiers, objects, complements etc.
A compound sentence is made up of two or more independent clauses.
This compound sentence consists of two simple clauses connected by the coordinating conjunction and.
Another example is given below.
This compound sentence consists of three independent clauses.
We make compound sentences by joining independent clauses with the help of coordinating conjunctions.
More examples of compound sentences are given below.
The words however, therefore and nevertheless are not conjunctions. They cannot be used to connect two independent clauses.
Two independent clauses need to be connected with a coordinating conjunction or separated with a full stop or a semicolon.