( ( The ( first two ) ) ( ( are ( ( ( ( all ( prokaryotic microorganisms ) ) , ) or ) ( ( single-celled organisms ) ( ( whose cells ) ( have ( no nucleus ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ first) (CD two)) (VP (VBP are) (NP (NP (DT all) (JJ prokaryotic) (NNS microorganisms)) (, ,) (CC or) (NP (NP (JJ single-celled) (NNS organisms)) (SBAR (WHNP (WP$ whose) (NNS cells)) (S (VP (VBP have) (NP (DT no) (NN nucleus)))))))) (. .)))
The first two are all prokaryotic microorganisms, or single-celled organisms whose cells have no nucleus.
(ROOT (S (NP (DT A) (JJ single-celled) (NN prokaryotic)) (VP (VBZ is) (NP (DT a) (NNS bacteria))) (. .)))