Complex sentence: On 6 March, 1943 his divorce from Frieda von Roemheld was finalised, and on 9 March he married Ingeborg Gräfin Berne Dorff.
Split into simpler sentences: On 6 March, 1943 his divorce from Frieda von Roemheld was finalized. Thereafter on 9 March he married Ingeborg Gräfin Berne Dorff.