Complex sentence: This behavior however only solidifies Akiyama's decision to help Nao, and at the end of the game when Akiyama forces him into debt, Nao helps him pay the debt, and he is last seen bowing to her in gratitude.
Split into simpler sentences: This behavior however only solidifies Akiyama's decision to help Nao, and at the end of the game Akiyama forces him into debt. Nao however helps him pay the debt, and he is last seen bowing to her in gratitude.