( ( The ( Moon ( s shadow ) ) ) ( sometimes ( ( ( ( falls ( onto ( the Earth ) ) ) , ) ( causing ( a ( solar eclipse ) ) ) ) . ) ) )
(ROOT (S (NP (DT The) (NNP Moon) (NNP s) (NN shadow)) (ADVP (RB sometimes)) (VP (VBZ falls) (PP (IN onto) (NP (DT the) (NN Earth))) (, ,) (S (VP (VBG causing) (NP (DT a) (JJ solar) (NN eclipse))))) (. .)))
The Moon s shadow sometimes falls onto the Earth, causing a solar eclipse .
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NP (NN earth) (POS 's)) (NN shadow)) (VP (VBZ falls) (PP (IN on) (NP (DT the) (NN moon)))))) (, ,) (NP (DT the) (NN shadow)) (VP (VBZ causes) (NP (DT a) (NN lunar) (NN eclipse))) (. .)))
When earth’s shadow falls on the moon, the shadow causes a lunar eclipse.