Complex sentence: He practiced law and worked in the oil industry while serving in the New Mexico House of Representatives from 1967 to 1974 and then from 1980 to 2004, first as a Republican and then as a Democrat.
Split into simpler sentences: He practiced law and worked in the oil industry. He served in the New Mexico House of Representatives from 1967 to 1974 and then from 1980 to 2004 first as a Republican and then as a Democrat.