Complex sentence: Considering the small number of personnel in the healthcare system in 1815 and the epidemics danger, a workaround was found, vaccinum procedure was taught in theology schools, so smallpox was prevented using the orthodox priests.
Split into simpler sentences: Considering the small number of personnel in the healthcare system in 1815 and the danger of epidemics, a way to work around the problem was found. The vaccination procedure was taught in theology schools, so smallpox was prevented using Orthodox priests.