Why are there double hinge lines on the rudders of the Grumman C-2? Why are there two sets of hinge lines on the rudders of the Grumman C-2?

A photo from the related ASE question Why does the C-2 left inboard stab not have a rudder?
Why would two hinge lines provide more control authority than just using the forward hinge line and deleting the rear one?
And why was it thought worth the extra complexity and weight to use this feature on this aircraft when so few other aircraft have been designed with this feature?
What other aircraft have been designed with this feature?
The double hinged rudder is also a Dehavilland Canada feature on most of its larger designs like the Caribou/Buffalo/Dash 7/Dash 8, where maximum yaw power for a given surface area was a design priority (especially if there are height or other limitations that prevent you from adding more area by going up; in the C-2's case, they also added more surfaces as well to limit height, an obvious issue on a carrier, and the same reason the Constellation had 3 tails).
It improves yaw power for a given overall surface area by allowing the rudder to operate at a larger net angle before significant flow separation, by allowing the airflow to make 2 smaller changes in direction vs one larger change in direction for the same overall displacement.
It's not quite as complicated as it looks.  The trailing edge segment is effectively a giant anti-servo tab and is simply geared to the vertical fin by a push rod.  The actuation system only has to drive the forward segment.  The extra parts and complexity are in the second set of hinges and the actuating rod.  In the C-2 pics you can see the gearing rod attachments in the little blisters. On the DeHavilland Canada products, the gearing rod is hidden at the base of the rudder.