From that spot she could see all of them and, should she need to, she could see through them as well.
( ( ( ( ( ( ( ( From ( that spot ) ) ( she ( could ( see ( all ( of them ) ) ) ) ) ) and ) , ) ( ( should she ) ( need to ) ) ) , ) ( she ( could ( ( see ( through them ) ) ( as well ) ) ) ) ) . )
(ROOT (S (S (PP (IN From) (NP (DT that) (NN spot))) (NP (PRP she)) (VP (MD could) (VP (VB see) (NP (NP (DT all)) (PP (IN of) (NP (PRP them))))))) (CC and) (, ,) (PRN (SINV (MD should) (NP (PRP she)) (VP (VB need) (PP (TO to))))) (, ,) (S (NP (PRP she)) (VP (MD could) (VP (VB see) (PP (IN through) (NP (PRP them))) (ADVP (RB as) (RB well))))) (. .)))
She could see through them all.
( She ( ( could ( see ( ( through them ) all ) ) ) . ) )
(ROOT (S (NP (PRP She)) (VP (MD could) (VP (VB see) (PP (IN through) (NP (PRP them)) (ADVP (DT all))))) (. .)))