Complex sentence: It's first part postulates that death should not be considered the end of existence and the second part emphasizes that the belief in immortal pattern of human existence can only be adopted in a morally rich life with the attitude towards morality and materialism balanced mutually.
Split into simpler sentences: It's first part theorizes that death should not be considered the end of existence. The next one postulates that the belief that the immortal pattern of human existence can only be adopted in a morally rich life with the attitude towards morality and materialism balanced mutually.