"During the Civil War, Douglass wanted it known that the war was a move to abolish slavery." is a complex sentence.
A complex sentence contains one independent clause and at least one or more dependent clauses.
A dependent clause always needs another clause to make sense. In the given sentence, "During the civil war" is a dependent clause and it has no meaning when written alone.
A compound sentence contains two independent clauses. An independent clause is one that has a proper meaning without the other clause.
These independent clauses are joined together using suitable conjunction such as: and, yet, for, so, and, & many more.
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