Complex sentence: Evidence was given by Captain Barnard, who had taken off from Croydon on a flight to Paris in DH.34 G-EBBY shortly after the accident occurred had radioed that he thought that aircraft should not be loaded so heavily as it was.
Split into simpler sentences: Evidence was given by Captain Barnard, who had taken off from Croydon on a flight to Paris in DH.34 G-EBBY shortly after the accident occurred. He had radioed that he thought that aircraft should not be loaded so heavily as it was.