Simplify the expression. 
Definitions:
American Psychoanalytic Association
A professional organization dedicated to the study and practice of psychoanalysis in the United States.
Informality
A behavior or manner that is relaxed and casual, not conforming strictly to traditional standards or rules.
Trieb
A German term used by Freud, often translated as "drive" or "instinct", referring to the internal forces that motivate behavior.
Motivating Forces
The internal or external factors that stimulate desire and energy in people to be continually interested and committed to a job, role, or subject, or to make an effort to attain a goal.
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