( ( Stars ( included ( in ( the ( globular clusters ) ) ) ) ) ( ( ( ( ( are ( very old ) ) ( normally ( over ( ( ( ( 10 billion ) years ) , ) ( about equal ) ) ) ) ) ( with ( the Galaxy ) ) ) itself ) . ) )
(ROOT (SINV (S (NP (NNP Stars)) (VP (VBD included) (PP (IN in) (NP (DT the) (NN globular) (NNS clusters))))) (VP (VBP are) (ADJP (RB very) (JJ old)) (PP (ADVP (RB normally)) (IN over) (NP (NP (QP (CD 10) (CD billion)) (NNS years)) (, ,) (ADJP (RB about) (JJ equal)))) (PP (IN with) (NP (DT the) (NNP Galaxy)))) (NP (PRP itself)) (. .)))
Stars included in the globular clusters are very old normally over 10 billion years, about equal with the Galaxy itself.
(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))))))))) (. .)))