§ 1 Does it make sense?
(1) This first sentences usually talk about the sense of the whole contract / agreement / whatever. Unlike many people think, it is not forbidden to lawyers to write plain text.
(2) But there are obstacles. We need some definitions.

§ 2 Share-purchase
(1) Let’s assume we talk about a share-deal agreement. We’d have to name the shares.
(2) And the price.