Complex sentence: When Asuma is fatally injured in battle, he reminds Shikamaru that the shogi king must always be protected, and draws a parallel between the king in shogi and his yet-unborn daughter, Mirai, whom he wanted Shikamaru to guide.
Split into simpler sentences: When Asuma is fatally injured in battle, he gives Shikamaru about how the king always needs to be protected in shogi. He then drew a parallel between the king in shogi and his yet-unborn daughter, Mirai, whom he wanted Shikamaru to guide.