Complex sentence: The group was instructed, hosted, promoted, and represented by Oscar Brousse Jacobson, who headed the school's art department, the six were among the few Native American artists of their era to receive international recognition individually and as an art movement.
Split into simpler sentences: The group was instructed, hosted, promoted, and represented by Oscar Brousse Jacobson, who headed the school's art department. The six were among the few Native American artists of their era to receive international recognition individually, and, as an art movement.