Complex sentence: A 12,000 strong Chinese army crushed and defeated the 20,000 strong army of Wali Khan in 77 days of combat and the Chinese inflicted harsh reprisals upon Wali Khan's forces and had his son and father in law executed in harsh manners.
Split into simpler sentences: A 12,000 strong Chinese army crushed and defeated the 20,000 strong army of Wali Khan in 77 days of combat. The Chinese inflicted harsh reprisals upon Wali Khan's forces and had his son and father in law executed in harsh manners.