Complex sentence: He is one of the founders of the Sudbury Valley School in Framingham, Massachusetts, a former physics professor at Columbia University, and is described by Lois Holzman as the school's "chief' philosophical writer'".
Split into simpler sentences: He is one of the founders and the principal philospher of the Sudbury Valley School in Framingham, Massachusetts. A former physics professor at Columbia University, and is described by Lois Holzman as the school's "chief' philosophical writer'".