A tree problem in Sequoia and Yosemite National Parks was involved in the use of the Big Tree areas by the visiting public.
(A tree problem in Sequoia and Yosemite National Parks; was involved; in the use of the Big Tree areas by the visiting public) (Parks; [is] National [of]; Yosemite)
A tree problem in Sequoia and Yosemite National Parks Parks
was involved [is] National [of]
in the use of the Big Tree areas by the visiting public
Yosemite