( ( ( The number ) ( of ( ( sunspots and ) faculae ) ) ) ( ( ( ( increases and ) decreases ) ( over ( ( a cycle ) ( of ( ( about 11 ) years ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN number)) (PP (IN of) (NP (NNS sunspots) (CC and) (NN faculae)))) (VP (VBZ increases) (CC and) (VBZ decreases) (PP (IN over) (NP (NP (DT a) (NN cycle)) (PP (IN of) (NP (QP (RB about) (CD 11)) (NNS years)))))) (. .)))
The number of sunspots and faculae increases and decreases over a cycle of about 11 years.
(ROOT (S (NP (NNS Sunspots)) (VP (VBP occur) (PP (IN in) (NP (DT a) (CD 11) (NN year) (NN cycle)))) (. .)))