Complex sentence: The XPB2M-1 was launched on 8 November 1941, after a delay caused by an engine fire during ground runs the aircraft first flew on 23 June 1942.
Split into simpler sentences: The XPB2M-1 was launched on 8 November 1941. After a delay caused by an engine fire during ground runs, the aircraft first flew on 23 June 1942.