Complex sentence: She realizes, after seeing Della Reese perform, that she lacks the desire, commitment, and talent be a singer, so she returns to her writing career, but this time in Los Angeles instead of in New York City like earlier in her life.
Split into simpler sentences: She realizes, after seeing Della Reese perform, that she lacks the desire, commitment, and talent to be a singer. She instead returns to her writing career, but this time in Los Angeles instead of in New York City as she had earlier in her life.