( ( ( The number ) ( of sunspots ) ) ( ( follows ( an ( 11-year cycle ) ) ) ; ) )
(ROOT (S (NP (NP (DT The) (NN number)) (PP (IN of) (NP (NNS sunspots)))) (VP (VBZ follows) (NP (DT an) (JJ 11-year) (NN cycle))) (: ;)))
The number of sunspots follows an 11-year cycle;
(ROOT (S (NP (NNS Sunspots)) (VP (VBP occur) (PP (IN in) (NP (DT a) (CD 11) (NN year) (NN cycle)))) (. .)))