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It expresses more complete ideas
*All* of them
It is a grammatical unit of one or more words that expresses a statement, opinion or decision
It is a grammatical unit of one or more words which expresses a statement, a question or a request. It is a communication
A well written sentence accurately and clearly expresses what you are trying to say. You will therefore be more likely to be understood by the person reading that sentence. That can be very helpful.
Example sentence - It is more important to be kind than right.
What kind of sentence? A long sentence.
It is a declarative sentence.
A sentence has a group of words that expresses a complete idea, that is a statement, a command, an exclamation, or a question. A sentence must have a subject and a verb in a main clause and may have one or more subordinate clauses.
The topic sentence is a primarily prescriptive grammatical term to describe what is usually, but not always, the first sentence in a paragraph. The topic sentence acts as a kind of summary and offers the reader an insightful view of the writer's main ideas for the following paragraph. More than just being a mere summary, however, a topic sentence often provides a claim or an insight directly or indirectly related to the thesis. It adds cohesion to a paper and helps organize ideas both within the paragraph and the whole body of work at large.
In this case, "accord" means "is hardly in accordance with" or, more simplistically, "...with which Mr. Boythorn expresses his opinion hardly matches his overall mildness and temperament." It's just saying that his mild manner contrasts with the way he expresses his opinions.
It expresses more complete ideas.