This statement came from the original docs, and I agree, it needs help. Interestingly enough, I was going through this section of the Frameworks chapter today and already reworded it. :-)  Here's what I came up with: 

Service Builder generates a service layer through Object-Relational Mapping (ORM) technology that provides a clean separation between your object model and code for the underlying database. This frees you to add the necessary business logic for your application.