Complex sentence: A hydrogen cyanide concentration of 300 mg/m 3 in air will kill a human within about 10 minutes.A hydrogen concentration of 3500 ppm (about 3200 mg/m 3) will kill a human in about 1 minute.
Split into simpler sentences: A hydrogen cyanide concentration of 300 mg/m 3 in air will kill a human within about 10 minutes. It is estimated that hydrogen cyanide at a concentration of 3500 ppm (about 3200 mg/m 3) will kill a human in about 1 minute.