Complex sentence: There is only a very small number of salaried staff, the hospital relying heavily on a large volunteer base, some of whom are students of Hadlow College who further their practical skills and support their studies through hands-on work experience at the hospital.
Split into simpler sentences: There is only a very small number of salaried staff, the hospital relying heavily on a large volunteer base. Many of the volunteers are students of Hadlow College who further their practical skills and support their studies through hands-on work experience at the hospital.