Breakdown of kare no heya wa kitanakatta node, souji o tetsudaimashita.
はwa
topic particle
のno
possessive case particle
をo
direct object particle
彼kare
he
手伝うtetsudau
to help
掃除souji
cleaning; sweeping
部屋heya
room
汚いkitanai
dirty
のでnode
because, since
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