Complex sentence: The cholera-causing gram negative bacterium "Vibrio cholerae", would not be isolated until 1854, ironically the same year as the Broad Street cholera outbreak, and not publicized until 1883 by Robert Koch, a German physician and bacteriologist.
Split into simpler sentences: The cholera-causing gram negative bacterium "Vibrio cholerae" would not be isolated until 1854. This finding was not publicized until 1883 by Robert Koch, a German physician and bacteriologist.