( ( These ( small ( single-celled organisms ) ) ) ( ( are ( called prokaryotes ) ) . ) )
(ROOT (S (NP (DT These) (JJ small) (JJ single-celled) (NNS organisms)) (VP (VBP are) (VP (VBN called) (NP (NNS prokaryotes)))) (. .)))
These small single-celled organisms are called prokaryotes .
(ROOT (S (NP (JJ Single-celled) (NNS organisms)) (VP (VBP are) (ADJP (JJ prokaryotes))) (. .)))