Complex sentence: Psychological contract breach could not decrease the organizational citizen behaviors for the employees with high trust based on the task competence but when the trust sources from the achievement of personal goals, trust could be a significant factor of the relation between the employees and their organization.
Split into simpler sentences: Psychological contract breach could not decrease the organizational citizen behaviors for the employees with high trust based on the task competence. However, when the trust sources from the achievement of personal goals, trust could be a significant factor of the relation between the employees and their organization.