On May 30, 1953, Sartoris was ordained into the priesthood by Cardinal James McIntyre for the Archdiocese of Los Angeles. After his ordination, Sartoris was assigned as an associate pastor to several parishes.
On May 30, 1953, Sartoris was consecrated by Cardinal James McIntyre for the Archdiocese of Los Angeles. Afterward, he took on the role of assisting pastors at various parishes.