( ( When ( ( the Moon ) ( passes ( behind ( ( the ( Earth 's ) ) shadow ) ) ) ) ) ( , ( that ( ( is ( called ( a ( lunar eclipse ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT the) (NNP Moon)) (VP (VBZ passes) (PP (IN behind) (NP (NP (DT the) (NN Earth) (POS 's)) (NN shadow)))))) (, ,) (NP (DT that)) (VP (VBZ is) (VP (VBN called) (NP (DT a) (NN lunar) (NN eclipse)))) (. .)))
When the Moon passes behind the Earth's shadow, that is called a lunar 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.