Complex sentence: The Definitive Guide to Overcoming Procrastination, Perfectionism, and Writer's Block because demanding perfection usually results in failure, these unrealistic expectations destroys self-esteem and leads to self-repudiation, self-contempt and widespread unhappiness.
Split into simpler sentences: The Definitive Guide to Overcoming Procrastination, Perfectionism, and Writer's Block because demanding perfection usually results in failure. Unrealistic expectations destroy self-esteem and lead to self-repudiation, self-contempt, and widespread unhappiness.