Complex sentence: He was born in Tacna, Peru and joined National University of San Marcos staff in 1960s were lectured general chemistry laboratory at Department of Chemistry, his devotion and significant research on chemistry led him to be elected as dean from 1964 to 1967.
Split into simpler sentences: He was born in Tacna, Peru and joined National University of San Marcos staff in 1960s to lecture general chemistry laboratory at Department of Chemistry. His devotion and significant research on chemistry led him to be elected as dean from 1964 to 1967.