( ( When ( ( dispersal ( and ( relaxation ( time calculations ) ) ) ) ( are ( applied ( to ( ( star clusters ) ( in ( our galaxy ) ) ) ) ) ) ) ) ( , ( ( many clusters ) ( ( ( show ( their ages ) ) ( to ( be ( ( greater ( ( than two ) billion ) ) years ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NN dispersal) (CC and) (NN relaxation) (NN time) (NNS calculations)) (VP (VBP are) (VP (VBN applied) (S (VP (TO to) (VP (VB star) (NP (NNS clusters)) (PP (IN in) (NP (PRP$ our) (NN galaxy)))))))))) (, ,) (NP (JJ many) (NNS clusters)) (VP (VBP show) (NP (PRP$ their) (NNS ages)) (S (VP (TO to) (VP (VB be) (NP (QP (JJR greater) (IN than) (CD two) (CD billion)) (NNS years)))))) (. .)))
When dispersal and relaxation time calculations are applied to star clusters in our galaxy, many clusters show their ages to be greater than two billion years.
(ROOT (S (NP (DT A) (NN galaxy)) (VP (VBZ is) (VP (RBS best) (VBN described) (PP (IN as) (NP (NP (DT a) (NN cluster)) (PP (IN of) (NP (NP (NNS billions)) (PP (IN of) (NP (NNS stars))))))))) (. .)))