Complex sentence: Unlike previous Chinese ballistic missiles, the DF-11 use solid fuel, which greatly reduces launch preparation time to around 15-30 minutes, while liquid-fuelled missiles such as the DF-5 require up to 2 hours of pre-launch preparation.
Split into simpler sentences: Unlike previous Chinese ballistic missiles, the DF-11 use solid fuel, which greatly reduces launch preparation time (15-30 min). Liquid-fueled missiles such as the DF-5 require up to 2 hours of pre-launch preparation.