The door opened and Severn stepped out.
( ( ( ( ( The door ) opened ) and ) ( Severn ( stepped out ) ) ) . )
(ROOT (S (S (NP (DT The) (NN door)) (VP (VBD opened))) (CC and) (S (NP (NNP Severn)) (VP (VBD stepped) (PRT (RP out)))) (. .)))
They were waiting for someone to open the door for them.
( They ( ( were ( ( waiting ( for someone ) ) ( to ( open ( ( the door ) ( for them ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD were) (VP (VBG waiting) (PP (IN for) (NP (NN someone))) (S (VP (TO to) (VP (VB open) (NP (NP (DT the) (NN door)) (PP (IN for) (NP (PRP them))))))))) (. .)))