Hello native English speakers.

BBC's chairman, Gavyn Davies, whether he drew any distinction between a broadcast that accused a prominent person of bribery and a broadcast that quoted a reliable source alleging that a public figure had taken bribes.(original)

Question: Is the original complete sentence? and grammatically correct?
I guess the original is something like a question.

Question

Hello native English speakers.

BBC's chairman, Gavyn Davies, whether he drew any distinction between a broadcast that accused a prominent person of bribery and a broadcast that quoted a reliable source alleging that a public figure had taken bribes.(original)

Question: Is the original complete sentence?  and grammatically correct? 
I guess the original is something like a question.

Answer

A sentence needs a subject-verb pair.  This is not a sentence because it has no such pair.

Answer

No it's not a complete sentence, and not grammatically correct.  It needs another comma where the period is, and then another supporting sentence to finish the thought of "BBC's chairman, Gavyn Davies,"  for instance  " BBC's chairman, Gavyn Davies, will talk about this more tomorrow".

song english, your understanding is very good, and you have the ability to notice this very slight issue.  English natives would read that and feel that it is not quite right, but of course we read so much and there are mistakes and typos all over the internet, so we just accept it.  That's life.  Right?