Complex sentence: His spirituality and his personal relationship with God became an important element of his final years, and those who knew him admired the peace and acceptance he had achieved as well as his ability to live his life without bitterness or self-pity.
Split into simpler sentences: His spirituality and his personal relationship with God became an important element of his final years. Those who knew him admired the peace and acceptance he had achieved, as well as his ability to live his life without bitterness or self-pity.