( ( The Sun ) ( ( ( ( ( reverses ( its ( magnetic fields ) ) ) ( every ( 11 years ) ) ) , ) ( with ( the ( sunspot cycle ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Sun)) (VP (VBZ reverses) (NP (PRP$ its) (JJ magnetic) (NNS fields)) (NP (DT every) (CD 11) (NNS years)) (, ,) (PP (IN with) (NP (DT the) (JJ sunspot) (NN cycle)))) (. .)))
The Sun reverses its magnetic fields every 11 years, with the sunspot cycle.
(ROOT (S (NP (NNS Sunspots)) (VP (VBP occur) (PP (IN in) (NP (DT a) (CD 11) (NN year) (NN cycle)))) (. .)))