The wood obstructing the river came from trees that naturally fell in and were washed downstream as well as trees that farmers along the banks cut and let fall into the river during land clearing activities.
(The wood; obstructing; the river) (The wood obstructing the river; came; from trees) (trees; naturally fell; ) (farmers along the banks; cut; )
The wood The wood obstructing the river trees farmers along the banks
obstructing came naturally fell cut
the river
from trees