Complex sentence: The aim of the Self-Strengthening Movement was to save the Qing Dynasty from being destroyed by internal rebellions and foreign aggression by rejuvenating the dynasty, by rehabilitating the devastated economy and by adopting appropriate strategies which would result in a strengthened China.
Split into simpler sentences: The aim of the Self-Strengthening Movement was to save the Qing Dynasty from being destroyed by internal rebellions and foreign aggression. It intended to do this by rejuvenating the dynasty, by rehabilitating the nation's devastated economy, and by adopting appropriate strategies that would result in a strengthened China.