Complex sentence: The submarine was laid down on 1 August 1940 at Blohm & Voss, Hamburg as yard number 551, launched on 30 April 1941 and commissioned on 19 June under the command of "Kapitänleutnant" Günther Heydemann.
Split into simpler sentences: The submarine was laid down on 1 August 1940 at Blohm & Voss, Hamburg, as yard number 551. She was launched on 30 April 1941 and commissioned on 19 June under the command of "Kapitänleutnant" Günther Heydemann.