( ( The sun ) ( ( is ( approaching ( ( the maximum ) ( of ( its ( 11-year ( sunspot cycle ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN sun)) (VP (VBZ is) (VP (VBG approaching) (NP (NP (DT the) (NN maximum)) (PP (IN of) (NP (PRP$ its) (JJ 11-year) (NN sunspot) (NN cycle)))))) (. .)))
The sun is approaching the maximum of its 11-year sunspot cycle.
(ROOT (S (NP (NNS Sunspots)) (VP (VBP occur) (PP (IN in) (NP (DT a) (CD 11) (NN year) (NN cycle)))) (. .)))