What we see are the "sudden" appearances of new species, which survive unchanged for a few million years, then disappear from the fossil record never to reappear.
(we; see; ) (What we see; are; the "sudden" appearances of new species) (new species; survive; L:unchanged; T:for a few million years)
we What we see new species
see are survive
the "sudden" appearances of new species
L:unchanged T:for a few million years