Complex sentence: Without vaccinations it could re-emarge and re-infect regions where it was eradicated decades ago, and the film also notes that the first line of defense is a dedicated and continual effort by international health workers going door-to-door to ensure every child is vaccinated.
Split into simpler sentences: Without vaccinations it could re-emarge and re-infect regions where it was eradicated decades ago. The film also notes that the first line of defense is a dedicated and continual effort by international health workers going door-to-door to ensure every child is vaccinated.