Complex sentence: Pakistan itself secured the release of Mujibur Rahman from the Headquarter Prison and allowing him to return to Dacca on 19 January 1972 as Mujib was inaugurated as the first President of Bangladesh later becoming the Prime Minister of Bangladesh in 1974.
Split into simpler sentences: Pakistan itself secured the release of Mujibur Rahman from the Headquarter Prison and allowed him to return to Dacca. On 19 January 1972 Mujib was inaugurated as the first President of Bangladesh, later becoming the Prime Minister of Bangladesh in 1974.