A former teacher at a Roman Catholic school in East Los Angeles has been sentenced to eight years in prison after he pleaded guilty to one count of importation of a minor alien for an immoral purpose and one count of transporting illegal immigrants. U.S. District Judge Alicemarie H. Stotler also placed John Karl Herriot, 34, on five years probation on the condition that he must not be in the presence of a minor unless the minor's parents are present. He also must accept employment that does not bring him into contact with minors, the judge said. When he was indicted in January, Herriot had allegedly molested at least 15 boys, including two he took from orphanages in Guatemala and El Salvador. He had been a teacher at Our Lady of Soledad School in East Los Angeles, Assistant U.S. Atty. Joyce A. Karlin said.