It's a subtle change in coloration, the green leaves of the oak and elm trees suddenly have a tinge of yellow brown to them.
(the green leaves of the oak and elm trees; have; a tinge of yellow brown; T:suddenly) Context(the green leaves of the oak and elm trees have,List([36, 91))):(It; 's; a subtle change in coloration)
the green leaves of the oak and elm trees have,List([36, 91))
the green leaves of the oak and elm trees It
have 's
a tinge of yellow brown T:suddenly
a subtle change in coloration