Chapter 9-3-1: The Loose Sentence
If you put your main point at the beginning of a long sentence, you are writing a loose sentence:
I am willing to pay slightly higher taxes for the privilege of living in Canada, considering the free health care, the cheap tuition fees, the low crime rate, the comprehensive social programs, and the wonderful winters.
The main point of this sentence is that the writer prefers to live in Canada, and the writer makes the point at the very beginning: everything which follows is simply extra information. When the readers read about the free health care, the cheap tuition fees, the low crime rate, the comprehensive social programs, and the wonderful winters, they will already know that these are reasons for living in Canada, and as a result, they will be more likely to understand the sentence on a first reading.
Loose sentences are the most natural for English speakers, who almost always talk in loose sentences: even the most sophisticated English writers tend to use loose sentences much more often than periodic sentences. While a periodic sentence can be useful for making an important point or for a special dramatic effect, it is also much more difficult to read, and often requires readers to go back and reread the sentence once they understand the main point.
Finally, it is important to remember that you have to structure a loose sentence as carefully as you would structure a periodic sentence: it is very easy to lose control of a loose sentence so that by the end the reader has forgotten what your main point was.