Making an early appearance before the trees leaf out enables these flowers to take advantage of the greater availability of sunlight filtering onto the forest floor.
(the trees; leaf out; ) (Making an early appearance before the trees leaf out; enables; these flowers; to take advantage of the greater availability of sunlight) (these flowers; to take; advantage; of the greater availability of sunlight)
the trees Making an early appearance before the trees leaf out these flowers
leaf out enables to take
these flowers to take advantage of the greater availability of sunlight
advantage of the greater availability of sunlight