To maximize the value of expenditures on external training and events, one central group required staff members who attended These events to brief others in the central group on what they had learned.
Before, there was no value of expenditures on external training and events. 
mnli hypothesis: Before, there was no value of expenditures on external training and events.  premise: To maximize the value of expenditures on external training and events, one central group required staff members who attended These events to brief others in the central group on what they had learned.