Complex sentence: The BBC did not agree to remove further allegations about the dumping such as the 16 September article:- "Trafigura knew of waste dangers"; this quoted from internal Trafigura emails which showed that the company knew the waste was toxic before they dumped it.
Split into simpler sentences: The BBC did not agree to remove further allegations about the dumping such as the September 16 article, "Trafigura knew of waste dangers". This quoted from internal Trafigura emails which showed that the company knew the waste was toxic before they dumped it.