If a landslide were about to happen, we would see a marked increase in the number of earthquakes and we would see the current sliding accelerate.
(a landslide; were; about to happen) (a landslide; to happen; ) (we; would see; a marked increase in the number of earthquakes) (we; would see; the current sliding accelerate)
a landslide a landslide we we
were to happen would see would see
about to happen
a marked increase in the number of earthquakes
the current sliding accelerate