(20) da?wohl zu wünschen wäre, Poussin hätte sein herrliches Talent in solchen Räumen betätigt.
that ?well ?to ?wish ?be:PAST.SUBJ.?Poussin ?have:PAST.SUBJ. his ?splendid ?talent ?in ?such ?places ?operate
[...] that it would be desirable that Poussin would have made use of his splendid talent in such places.