Complex sentence: Coniine (in the story, specifically coniine hydrobomide, derived from the poison Hemlock) was indeed the poison with which Socrates took his own life, as described by Phaedo, and has indeed been used to treat whooping cough and asthma.
Split into simpler sentences: Coniine (in the story specifically coniine hydrobomide, derived from the poison Hemlock) was indeed the poison with which Socrates took his own life, as described by Phaedo. Coniine has indeed been used to treat whooping cough and asthma.