Complex sentence: In 1806, Alexandre Pétion launched a coup against Haiti's emperor, Jean-Jacques Dessalines though General Christophe was aware of this through his system of spies he did not warn Dessaline viewing his assassination as a necessary evil that would permit him to achieve his goals.
Split into simpler sentences: In 1806, Alexandre Pétion launched a coup against Haiti's emperor, Jean-Jacques Dessalines. Though General Christophe was aware of this through his system of spies, he did not warn Dessaline viewing his assassination as a necessary evil that would permit him to achieve his goals.