Chapter 9-3-2: The Periodic Sentence
If your main point is at the end of a long sentence, you are writing a periodic sentence:
Considering the free health care, the cheap tuition fees, the low crime rate, the comprehensive social programs, and the wonderful winters, I am willing to pay slightly higher taxes for the privilege of living in Canada.
The main point of this sentence is that the writer prefers to live in Canada. At the beginning of this sentence, the reader does not know what point the writer is going to make: what about the free health care, cheap tuition fees, low crime rate, comprehensive social programs, and wonderful winters? The reader has to read all of this information without knowing what the conclusion will be.
The periodic sentence has become much rarer in formal English writing over the past hundred years, and it has never been common in informal spoken English (outside of bad political speeches). Still, it is a powerful rhetorical tool. An occasional periodic sentence is not only dramatic but persuasive: even if the readers do not agree with your conclusion, they will read your evidence first with open minds. If you use a loose sentence with hostile readers, the readers will probably close their minds before considering any of your evidence.
Finally, it is important to remember that periodic sentences are like exclamatory sentences: used once or twice in a piece of writing, they can be very effective; used any more than that, they can make you sound dull and pompous.