This sentence is using an analogy to explain the role of sovereignty in a contract and its relationship to an artificial person.
The sentence begins by stating that the "sovereign" is the ruling force behind the contract, meaning that the person or entity with the highest authority or power is responsible for creating and enforcing the terms of the contract.
Then, the sentence introduces an analogy between the contract and an artificial person. An artificial person is a legal concept used to describe a non-human entity, such as a corporation or government, that has certain legal rights and obligations.
The sentence goes on to say that in this analogy, the concept of sovereignty is the "soul" of the artificial person. This is because sovereignty refers to the supreme power or authority that is held by the entity, much like the soul is considered to be the essence or defining characteristic of a living being.
Finally, the sentence states that the sovereign itself is like the "head" of the artificial person, suggesting that the sovereign is the highest authority within the entity and is responsible for making decisions and enforcing the entity's will.
Overall, the sentence is using an analogy to explain the important role of sovereignty in a contract and how it relates to the concept of an artificial person.