Complex sentence: Historians Griehl and Dressel state that the Ju 390 V2 was assembled in Bernburg, was first flown in October 1943, and said it was configured for a maritime reconnaissance role.
Split into simpler sentences: Historians Griehl and Dressel state that the Ju 390 V2 was assembled in Bernburg and first flown in October 1943. They further said that it was configured for a maritime reconnaissance role.