Breakdown of kore wa juuyouna shorui kara, nakushimasen. kore wa juuyouna shoruina kara, nakushimasen.
はwa
topic particle
これkore
this (one) pronoun
からkara
because, since
無くすnakusu
to lose something
重要juuyou
important; significant
書類shorui
(official) document
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