Leadership and communication are closely intertwined.
You can be the most able, most understanding, most caring, most decisive and most noble leader, but if you can't communicate with others - all those precious attributes are in vain.
So how to bring leadership and communication closer together? Simplify. Clarify.
Clear thoughts lead to clear words, and clear words lead to clear actions. In your relationships with people keep what's important always in the foreground (trust, understanding, respect, love), and learn to keep quiet when you don't have anything smart to say.
Such inner self-discipline of a leader is naturally reflected in the actions of a leader. By keeping your eye on the goals and taking clear steps towards them, you can lead naturally and not through force, rhetorics or persuasion.