( ( The Sun ) ( ( follows ( ( an ( 11-year ( sunspot cycle ) ) ) ( of activity ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Sun)) (VP (VBZ follows) (NP (NP (DT an) (JJ 11-year) (NN sunspot) (NN cycle)) (PP (IN of) (NP (NN activity))))) (. .)))
The Sun follows an 11-year sunspot cycle of activity.
(ROOT (S (NP (NNS Sunspots)) (VP (VBP occur) (PP (IN in) (NP (DT a) (CD 11) (NN year) (NN cycle)))) (. .)))