Complex sentence: Imad-ul-Mulk intercepted such letters made lasting peace with Suraj Mal and returned to the emperor in Delhi and caused menaces by executing Javed Khan, he then blinded Ahmad Shah Bahadur, after hearing of this action Safdarjung fell ill and died.
Split into simpler sentences: Imad-ul-Mulk intercepted such letters, made lasting peace with Suraj Mal, and returned to the emperor in Delhi and caused menaces by executing Javed Khan. He then blinded Ahmad Shah Bahadur; after hearing of this action Safdarjung fell ill and died.