Complex sentence: The key problem of the trial was that Edwin was poisoned by liquid chloroform, which was found in his stomach, but liquid chloroform burns the throat if swallowed, and the drinker would be screaming.
Split into simpler sentences: The key problem of the trial was that Edwin was poisoned by liquid chloroform, which was found in his stomach. But liquid chloroform burns the throat if swallowed, and the drinker would be screaming.