He received the support of the French Governor-General Joseph François Dupleix , who helped release Chanda Sahib the son-in-law of Dost Ali Khan , who was imprisoned after being overrun by the Marathas and after his father-in-law was killed in the fray .
PRON VERB DET NOUN ADP DET PROPN PROPN PROPN PROPN PROPN , PRON AUX VERB PROPN PROPN DET NOUN ADP PROPN PROPN PROPN , PRON AUX VERB ADP AUX VERB ADP DET PROPN CCONJ ADP PRON NOUN AUX VERB ADP DET NOUN .