The manager called the meeting. is a Fragment sentence
An incomplete sentence is one that lacks either the subject or the main verb. Some sentence fragments are the consequence of straightforward typos or word omissions. With attentive proofreading, they can frequently be avoided.
Highly competent authors frequently employ sentence fragments to give their text a conversational, informal tone. They frequently occur in speech as well. However, it's often preferable to avoid sentence fragments in contexts where formality is anticipated, such as in a business letter or academic paper.
A whole thought is expressed in a sentence, but a fragment leaves the reader in the dark regarding the subject and verb. The rule against using fragments in professional writing frequently makes sense.
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