Perhaps a further password would be required, or, at any rate, some proof of identity.
( ( ( ( ( ( Perhaps ( ( a ( further password ) ) ( would ( be required ) ) ) ) , ) or ) , ) ( ( at ( any rate ) ) ( , ( ( some proof ) ( of identity ) ) ) ) ) . )
(ROOT (S (S (ADVP (RB Perhaps)) (NP (DT a) (JJ further) (NN password)) (VP (MD would) (VP (VB be) (VP (VBN required))))) (, ,) (CC or) (, ,) (S (PP (IN at) (NP (DT any) (NN rate))) (, ,) (NP (NP (DT some) (NN proof)) (PP (IN of) (NP (NN identity))))) (. .)))
Having both a password and proof of identity greatly increases safety.
( ( ( Having ( ( both ( a ( ( password and ) proof ) ) ) ( of identity ) ) ) greatly ) ( ( increases safety ) . ) )
(ROOT (S (S (VP (VBG Having) (NP (NP (CC both) (DT a) (NN password) (CC and) (NN proof)) (PP (IN of) (NP (NN identity)))) (ADVP (RB greatly)))) (VP (VBZ increases) (NP (NN safety))) (. .)))