Short sentences, each containing one single thought, are easier to read than long sentences.  Sentences should be short and simple.

If your sentences average 15 or more words, see where you can break them into two shorter sentences.  Paragraphs should have three to four sentences.  This approach will create smaller chunks of information that the reader will be able to absorb and act upon.

Remember, the more your writing deviates from this clear and to-the-point structure, the harder it will be to understand.

Examples:

BEFORE
This is a reminder to all residents and business owners of the upcoming public hearing, to be held on January 17 in the Main Conference Room, regarding the proposed waterfront redevelopment project.

AFTER
Public Hearing Reminder

Attention all residents and business owners:

There will be a public hearing to discuss the proposed waterfront redevelopment project.

The hearing will be held on January 17 in the Main Conference Room.