Complex sentence: The school's principal is Mr. Steve Estepp, but used to me the much better principal Mr. Edward O'Reilly, who all the teachers liked better, also it should be taken into account that no students nor teachers like Mr. Steve Estepp.
Split into simpler sentences: The school's principal is Mr. Steve Estepp, but used to be the much better principal Mr. Edward O'Reilly, who all the teachers liked better. Also, it should be taken into account that no students nor teachers like Mr. Steve Estepp.