Complex sentence: The downed aircraft was a Wellesley (L2669) from No.14 Squadron, flown by Sergeant Norris on a photographic reconnaissance sortie over Harmil Island, when it was intercepted and attacked by Fiat fighters, scrambled from Massawa.
Split into simpler sentences: The downed aircraft was Wellesley (L2669) from No.14 Squadron, flown by Sergeant Norris. The Wellesley was on a photographic reconnaissance sortie over Harmil Island, when it was intercepted and attacked by Fiat fighters, scrambled from Massawa.