Complex sentence: In 1992 he was appointed Secretary of Education by president Carlos Salinas, a year later he resigned to run the electoral campaign of Luis Donaldo Colosio, the PRI's presidential candidate.
Split into simpler sentences: In 1992 he was appointed Secretary of Education by president Carlos Salinas. A year later he resigned to run the electoral campaign of Luis Donaldo Colosio, the PRI's presidential candidate.