Complex sentence: One school in the Cleveland Metropolitan School District was disinfected overnight due to similar concerns but remained open, school officials said that they had been assured by city health officials that there was no risk, and that that the disinfection was "strictly precautionary".
Split into simpler sentences: One school in the Cleveland Metropolitan School District was disinfected overnight due to similar concerns but remained open. School officials said that they had been assured by city health officials that there was no risk and that that the disinfection was "strictly precautionary".