Complex sentence: However, the baker who had been charged with lacing bread with arsenic bungled the attempt by putting an excess of the poison into the dough, such that his victims vomited sufficient quantities of the poison that they had only a non-lethal dose left in their system.
Split into simpler sentences: However, the baker who had been charged with lacing bread with arsenic bungled the attempt by putting an excess of the poison into the dough. This meant that his victims threw up sufficient quantities of the poison as to only have a non-lethal dose left in their system.