Complex sentence: Under the support of a group of visionary businessmen, who formed Instituto Educativo del Noroeste (IENAC), a non-profit civil association that supports CETYS, the institution opened its doors on September 20,1961, in Mexicali.
Split into simpler sentences: Under the support of a group of visionary businessmen, who formed the Instituto Educativo del Noroeste (IENAC), a not-for-profit civil association that supports CETYS. The institution opened its doors on September 20,1961, in Mexicali.