Full Idea
If predicates are names of entities, then subject/predicate sentences are pairs of names, since subjects are names (or referring expressions). But a pair of names is not a sentence at all, it is a mere list.
Gist of Idea
If predicates name things, that reduces every sentence to a mere list of names
Source
David E. Cooper (Philosophy and the Nature of Language [1973], §4.4)
Book Reference
Cooper,David E.: 'Philosophy and the Nature of Language' [Longman 1979], p.93
A Reaction
If that is meant to demolish universals it is too quick. Concatenating names is not the same as listing them. A relationship is asserted. There is a (mysterious) Platonic 'partaking' between form and particular. Perhaps.