Complex sentence: While the Duke awaited what was likely to be a long prison sentence, he began poisoning himself with what is believed to be arsenic, and he died within six days of first appearing sick on August 24,1847.
Split into simpler sentences: While the Duke awaited what was likely to be a long prison sentence, he began poisoning himself with what is believed to be arsenic. He died within six days of first appearing sick on August 24,1847.