Complex sentence: The powder was later analyzed, and found to contain cyanide of mercury, and 28 February 1899 Barnet's body was exhumed and the organs, when analyzed, were found to contain the same poison.
Split into simpler sentences: The powder was later analyzed, and found to contain cyanide of mercury. On 28 February 1899 Barnet's body was exhumed and the organs, when analyzed, were found to contain the same poison.