( ( ( The variations ) ( in ( the ( magnetic field ) ) ) ) ( ( reflect ( the ( 11-year ( solar ( sunspot cycle ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NNS variations)) (PP (IN in) (NP (DT the) (JJ magnetic) (NN field)))) (VP (VBP reflect) (NP (DT the) (JJ 11-year) (JJ solar) (NN sunspot) (NN cycle))) (. .)))
The variations in the magnetic field reflect the 11-year solar sunspot cycle.
(ROOT (S (NP (NNS Sunspots)) (VP (VBP occur) (PP (IN in) (NP (DT a) (CD 11) (NN year) (NN cycle)))) (. .)))