Complex sentence: The final theme, "Epilogue", was co-composed by Hamauzu and Nakama: it was based on the concept of the "XIII" games coming to an end, and so was intended to convey the themes and atmosphere of the soundtrack.
Split into simpler sentences: The final theme, "Epilogue", was co-composed by Hamauzu and Nakama. It was based on the concept of the "XIII" games coming to an end, and so was intended to convey the themes and atmosphere of the soundtrack.