When people are asked about short answers, most of them give long speeches. When they are requested to do a 1-minute elevator pitch, they complain about not being able to say everything about their company. When they have 10 minutes, they tend to spend as much as the moderator allows them to. They are awful speakers. Maybe bad leaders.
Communication implies that your message reaches clearly your target audience. This means that you need to explain the key ideas briefly, to the point, not the full version. No one is interested in the whole story from the beginning, you need to attract their attention, and then, they will give you more time if they want. Not if you decide. So go step by step.
I love the concept from the book Made to Stick by Chip and Dan Heath: use Simple, Unexpected, Concrete, Credible, Emotional Stories.