If you want officials to read and understand your letter - this is how to write it:
Topic sentence - the first sentence should clearly and briefly state the purpose of the letter. In the same paragraph you can introduce yourself and your relationship to the issue.
The 2nd paragraph should clearly and briefly state the issues/problems. If there is more than one, make a bulleted list.
The 3rd paragraph should clearly and briefly state what action you are requesting.
Officials will not read a long winded letter - be as brief as you can. Half a page is ideal, two pages should be maximum.
Correct spelling and punctuation impress the reader, and they make your letter easier to understand. Use spell check and have someone who is a good writer check your letter for you.