Complex sentence: Commander Tasnim first diverted the submarine's position and managed to forecast target ships movement succeeded in taking up a tactically advantageous position on the path of the patrolling frigates by 1900 hours.
Split into simpler sentences: Commander Tasnim first diverted the submarine's position and managed to forecast the target ships movement. He then succeeded in taking up a tactically advantageous position on the path of the patrolling frigates by 1900 hours.