( ( ( ( They ( are ( dormant ( in ( terms ( of ( ( many generations ) ( of ( human ( life span ) ) ) ) ) ) ) ) ) ) but ) ( they ( can ( ( come ( to life ) ) again ) ) ) ) . )
(ROOT (S (S (NP (PRP They)) (VP (VBP are) (ADJP (JJ dormant) (PP (IN in) (NP (NP (NNS terms)) (PP (IN of) (NP (NP (JJ many) (NNS generations)) (PP (IN of) (NP (JJ human) (NN life) (NN span)))))))))) (CC but) (S (NP (PRP they)) (VP (MD can) (VP (VB come) (PP (TO to) (NP (NN life))) (ADVP (RB again))))) (. .)))
They are dormant in terms of many generations of human life span but they can come to life again.
(ROOT (S (NP (NNP Life) (NN cycle)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (DT the) (NN span)) (PP (IN in) (NP (NP (DT the) (NN life)) (PP (IN of) (NP (NP (DT an) (NN organism)) (PP (IN from) (NP (NP (CD one) (NN generation)) (PP (TO to) (NP (DT the) (JJ next))))))))))))) (. .)))