What's the difference between a simple sentence, a compound sentence, a complex sentence, and a compound-complex sentence?

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 compound-complex sentence has both a complex and compound sentence (hence the name).

Explanation:

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to inform the reader that the text will take a second look at the grimms’ original tales