Complex sentence: As they tell Poirot the details, news reaches them by special courier that the bogus car has now been found abandoned and containing Captain Daniels, the Prime Minister's secretary, chloroformed and gagged.
Split into simpler sentences: As they tell Poirot the details, news reached them by special courier that the bogus car was found abandoned. It contained Captain Daniels, the Prime Minister's secretary, chloroformed and gagged.