Mother was treated with magnesium sulfate.
 The mother was given magnesium sulfate during pregnancy
(ROOT (S (NP (NN Mother)) (VP (VBD was) (VP (VBN treated) (PP (IN with) (NP (NN magnesium) (NN sulfate))))) (. .)))
(ROOT (S (NP (DT The) (NN mother)) (VP (VBD was) (NP (VBN given) (NN magnesium) (NN sulfate)) (PP (IN during) (NP (NN pregnancy))))))
( Mother ( ( was ( treated ( with ( magnesium sulfate ) ) ) ) . ) )
( ( The mother ) ( ( was ( given ( magnesium sulfate ) ) ) ( during pregnancy ) ) )