Complex sentence: Kala Jahangir (died. December 15,2003), was a notorious Bangladeshi crime boss according to the police report, who came from an educated family, both his father and mother have been teachers of reputed schools in Bogra and Dhaka respectively.
Split into simpler sentences: Kala Jahangir (believed to have died December 15,2003), was a notorious Bangladeshi crime boss. Both his father and mother have been teachers at reputable schools in Bogra and Dhaka respectively.