2 Answers

A sentence is a self-contained unit of meaning.

Writing is constructed by putting sentences in sequence, one after another and, if a single sentence is read aloud, it should be understandable. 

Meaning should flow from one sentence to the next, carrying the argument or point of view forward in a clear and concise manner.  If you do not use correct grammar and punctuation, or your sentences are too long and complex, what you are trying to say will become unclear and the reader will be unable to follow the text because the flow of meaning is interrupted.

If writing is a relatively new experience, or it is some time since you last wrote anything, write in fairly short, simple sentences.  Aim to make one point in each sentence or paragraph if the point is more complex.  If a sentence delivers two points, consider splitting it into two sentences.

Inconsistencies of grammar and mistakes in grammar blur the meaning of written work and cause confusion in the mind of the reader.  They slow the reader down and distract him or her from the meaning of the sentences and the key messages contained.

Find more at: http://www.skillsyouneed.com/write/grammar1.html#ixzz4H08Emc5F

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