Remember this account describes something that existed before the Flood had undoubtedly widely changed the surface of the earth.
(something; existed; T:before the Flood had undoubtedly widely changed the surface of the earth) (the Flood; had undoubtedly widely changed; the surface of the earth)
something the Flood
existed had undoubtedly widely changed
T:before the Flood had undoubtedly widely changed the surface of the earth
the surface of the earth