This entity was undoubtedly the same as our pre-symbolic ancestors used, and probably the one that underlies learned animal behavior in chimps, dogs, horses, and other species.
(This entity; was undoubtedly; the same as our pre-symbolic ancestors used) (our pre-symbolic ancestors; used; ) (probably the one; underlies; learned animal behavior in chimps, dogs, horses, and other species)
This entity our pre-symbolic ancestors probably the one
was undoubtedly used underlies
the same as our pre-symbolic ancestors used
learned animal behavior in chimps, dogs, horses, and other species