( ( The program ) ( ( ( was ( very enlightening ) ) ( on ( ( ( the history ) and ) ( ( 11 ( year cycle ) ) ( of sunspots ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN program)) (VP (VBD was) (ADJP (RB very) (JJ enlightening)) (PP (IN on) (NP (NP (DT the) (NN history)) (CC and) (NP (NP (CD 11) (NN year) (NN cycle)) (PP (IN of) (NP (NNS sunspots))))))) (. .)))
The program was very enlightening on the history and 11 year cycle of sunspots.
(ROOT (S (NP (NNS Sunspots)) (VP (VBP occur) (PP (IN in) (NP (DT a) (CD 11) (NN year) (NN cycle)))) (. .)))