LSC staff planned and coordinated this conference, and the Corporation sponsored the participation of executive directors by covering their travel costs.
It took LSC staff 6 months to plan a conference that would last 2 hours. 
mnli hypothesis: It took LSC staff 6 months to plan a conference that would last 2 hours.  premise: LSC staff planned and coordinated this conference, and the Corporation sponsored the participation of executive directors by covering their travel costs.