original: Subsequently, in February 1941, 600 Jews were sent to Buchenwald and Mauthausen concentration camps.
simplifications: In February 1941, 600 Jews were sent to Buchenwald and Mauthausen concentration camps. After that 600 Jews were sent to Buchenwald and Mauthausen concentration camps in 1941. 600 Jews were sent to Buchenwald and Mauthausen concentration camps in 1941. In February 1941, 600 Jews were sent to Buchenwald and Mauthausen concentration camps. After, in February 1941, 600 Jews were sent to Buchenwald and Mauthausen concentration camps. Jews were sent to Buchenwald and Mauthausen concentration camps on  February 1941. In 1941, 600 Jews were sent to Buchenwald and Mauthausen concentration camps. In February of 1941, 600 Jews were sent to two concentration camps. These two concentration camps were Buchenwald and Mauthausen. 600 Jews were sent to Buchenwald and Mauthausen concentration camps in February of 1941. In February 1941, 600 Jews were sen to Buchenwald and Mauthausen concentration camps.