Complex sentence: Just after Nagisa gives birth to their daughter Ushio, she dies, shattering Tomoya's life and he falls into a deep depression and is barely able to function let alone look after an infant.
Split into simpler sentences: Just after Nagisa gives birth to their daughter Ushio, she dies, shattering Tomoya's life. He falls into a deep depression, and is barely able to function, let alone look after an infant.