Complex sentence: He again fought British with the help of Marathas at Kara Jahanabad and was defeated.On Aug 16,1765 AD he signed the Treaty of Allahabad, which said that Kora and Allahabad district will go to Company and Company will get 50 lakh rupees from Oudh.
Split into simpler sentences: He again fought British with the help of Marathas at Kara Jahanabad and got defeated. So on Aug 16,1765 AD he signed on "Allahabad Treaty", which says that Kara and Allahabad district will go to Company and Company will get 50 lakhs of rupees from Oudh.