Complex sentence: The SSS-8 has a higher order general factor structure which consists of a general factor and four lower order facets (gastrointestinal symptoms, pain, cardiopulmonary symptoms, and fatigue).
Split into simpler sentences: The SSS-8 has a higher order general factor structure. It consists of a general factor and four lower order facets (gastrointestinal symptoms, pain, cardiopulmonary symptoms, and fatigue).