If a sentence consists of one clause it is described as a simple sentence. Each of the following is a simple sentence:
Mary writes books.
She has not been very successful.
She is looking for another career.
If a sentence contains more than one clause it is described as a multiple sentence. Each of the following sentences is multiple:
She has not been very successful and She is looking for another career.
Although Mary writes books, She has not been very successful.
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