Complex sentence: Self-efficacy is a term used in psychology, roughly corresponding to a person's belief in his/her own competence, i.e., as the belief that one is capable of performing in a certain manner to attain a certain set of goals.
Split into simpler sentences: Self-efficacy is a term used in psychology, roughly corresponding to a person's belief in his/her own competence. It has been defined as the belief that one is capable of performing in a certain manner to attain a certain set of goals.