Complex sentence: Following the failure of last-ditch talks, Yahya Khan declared martial law and ordered the army to crack down on Bengali political activities and arrested Sheikh Mujib on the early mornings of 26 March 1971.
Split into simpler sentences: Following the failure of last-ditch talks, Yahya Khan declared martial law and ordered the army to crack down on Bengali political activities. They arrested Sheikh Mujib on the early mornings of 26 March 1971.