Complex sentence: When war in Europe threatened the security of the entire world, "Kalk" recommissioned 17 June 1940, Lt. T. P. Elliott in command; departing Philadelphia 26 July, she arrived Charleston the 31st for duty with the Neutrality Patrol in the Atlantic.
Split into simpler sentences: When war in Europe threatened the security of the entire world, "Kalk" recommissioned 17 June 1940, Lt. T. P. Elliott in command. Departing Philadelphia 26 July, she arrived Charleston the 31st for duty with the Neutrality Patrol in the Atlantic.