Complex sentence: According to the school, the university's operations are centered on its more than 6,000 volunteers, who fill roles at every level of the organization, from lecturers to administrative staff, who are supported by an alleged small staff of salaried employees.
Split into simpler sentences: According to the school, the university's operations are centered on its more than 6,000 volunteers, who fill roles at every level of the organization, from lecturers to administrative staff. These volunteers are supported by an alleged small staff of salaried employees.