Complex sentence: Mir Quasem Ali (31 December 1952--3 September 2016) was a Bangladeshi tycoon, the former director of Islami Bank, and chairman of the Diganta Media Corporation, which owns Diganta TV.
Split into simpler sentences: Mir Quasem Ali (31 December 1952--3 September 2016) was a Bangladeshi tycoon. He was the former director of Islami Bank, and chairman of the Diganta Media Corporation, which owns Diganta TV.