Complex sentence: He was shot down in the vicinity of the Isle of Wight on 28 November 1940, very likely by the British ace John Dundas, who was subsequently shot down by Wick's wingman.
Split into simpler sentences: He was shot down in the vicinity of the Isle of Wight on 28 November 1940. It is very likely that Wick was shot down by the British ace John Dundas, who was himself shot down by Wick's wingman.