( Ribosomes ( ( are ( composed ( of ( ( ( two ( complex subunits ) ) , ) ( ( each ( of which ) ) ( includes ( rRNA ( and ( protein components ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Ribosomes)) (VP (VBP are) (VP (VBN composed) (PP (IN of) (NP (NP (CD two) (JJ complex) (NNS subunits)) (, ,) (SBAR (WHNP (NP (DT each)) (WHPP (IN of) (WHNP (WDT which)))) (S (VP (VBZ includes) (NP (NN rRNA) (CC and) (NN protein) (NNS components))))))))) (. .)))
Ribosomes are composed of two complex subunits, each of which includes rRNA and protein components.
(ROOT (S (NP (DT A) (NN ribosome)) (VP (VBZ consists) (PP (IN of) (NP (NP (CD two) (NNS elements)) (, ,) (NP (NN rrna)) (CC and) (NP (NNS proteins))))) (. .)))
A ribosome consists of two elements, rrna and proteins.