( ( Because ( ( a bird ) ( needs ( a ( safe ( place ( to ( lay ( its eggs ) ) ) ) ) ) ) ) ) ( , ( ( a bird ) ( ( builds ( a nest ) ) . ) ) ) )
(ROOT (S (SBAR (IN Because) (S (NP (DT a) (NN bird)) (VP (VBZ needs) (NP (DT a) (JJ safe) (NN place) (S (VP (TO to) (VP (VB lay) (NP (PRP$ its) (NNS eggs))))))))) (, ,) (NP (DT a) (NN bird)) (VP (VBZ builds) (NP (DT a) (NN nest))) (. .)))
Because a bird needs a safe place to lay its eggs, a bird builds a nest.
(ROOT (S (NP (NNP Birds)) (VP (VBP build) (NP (NNS nests)) (PP (TO to) (NP (JJ safe) (NN place)))) (. .)))
Birds build nests to safe place.