If necessary to meeting the restrictions imposed in the preceding sentence, the Administrator shall reduce, pro rata, the basic Phase II allowance allocations for each unit subject to the requirements of section 414.
( ( If ( ( necessary ( to ( meeting ( the restrictions ) ) ) ) ( imposed ( in ( the ( preceding sentence ) ) ) ) ) ) ( , ( ( the Administrator ) ( ( shall ( ( ( ( reduce , ) ( pro rata ) ) , ) ( ( ( the ( basic ( Phase ( II ( allowance allocations ) ) ) ) ) ( for ( each unit ) ) ) ( subject ( to ( ( the requirements ) ( of ( section 414 ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (S (ADJP (JJ necessary) (PP (TO to) (S (VP (VBG meeting) (NP (DT the) (NNS restrictions))))))) (VP (VBD imposed) (PP (IN in) (NP (DT the) (VBG preceding) (NN sentence)))))) (, ,) (NP (DT the) (NNP Administrator)) (VP (MD shall) (VP (VB reduce) (, ,) (ADVP (FW pro) (FW rata)) (, ,) (S (NP (NP (DT the) (JJ basic) (NNP Phase) (NNP II) (NN allowance) (NNS allocations)) (PP (IN for) (NP (DT each) (NN unit)))) (ADJP (JJ subject) (PP (TO to) (NP (NP (DT the) (NNS requirements)) (PP (IN of) (NP (NN section) (CD 414))))))))) (. .)))
The administrator shall reduce allowance for each unit. 
( ( The administrator ) ( ( shall ( ( reduce allowance ) ( for ( each unit ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN administrator)) (VP (MD shall) (VP (VB reduce) (NP (NN allowance)) (PP (IN for) (NP (DT each) (NN unit))))) (. .)))