( However ( , ( ( in 1990 ) ( ( the ( microbiologist ( Carl Woese ) ) ) ( ( proposed ( ( the ( three-domain system ) ) ( that ( ( divided ( living things ) ) ( into ( bacteria ( , ( ( archaea and ) eukaryotes ) ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (PP (IN in) (NP (CD 1990))) (NP (DT the) (JJ microbiologist) (NNP Carl) (NNP Woese)) (VP (VBD proposed) (NP (NP (DT the) (JJ three-domain) (NN system)) (SBAR (WHNP (WDT that)) (S (VP (VBD divided) (NP (NN living) (NNS things)) (PP (IN into) (NP (NNS bacteria) (, ,) (NN archaea) (CC and) (NNS eukaryotes)))))))) (. .)))
However, in 1990 the microbiologist Carl Woese proposed the three-domain system that divided living things into bacteria, archaea and eukaryotes.
(ROOT (S (NP (NNP Carl) (NNP woese)) (VP (VBN constructed) (NP (DT a) (NN tree) (NN diagram)) (, ,) (S (VP (VBG separating) (NP (VBG living) (NNS organisms)) (PP (IN into) (NP (CD three) (NNS domains)))))) (. .)))