Complex sentence: When Gennosuke arrived, Kagerou already was in a near death state; after Tenzen's and Gennosuke's battle, she was carried away by Gennosuke and then died in his arms.
Split into simpler sentences: When Gennosuke arrived, Kagerou was in a near death state. After Tenzen's and Gennosuke's battle, she was carried by Gennosuke and then she died in his arms.