Complex sentence: He was promoted again on 1 February 1940 to "Hauptmann", to lead I./Jagdgeschwader 1 as "Gruppenkommandeur" in the campaign against France, he shot down a Bristol Blenheim on 12 May and a LeO 45 on 6 June.
Split into simpler sentences: He was promoted again on 1 February 1940, to lead I./Jagdgeschwader 1 as "Gruppenkommandeur". In the campaign against France he shot down a Bristol Blenheim on 12 May and a LeO 45 on 6 June.