Complex sentence: In the 1971 Democratic primary in which Rosenthal ran for the state Senate against Blair and Smith, Oubre sought the office of state attorney general but lost the party nomination to William J. "Billy" Guste, Jr., of New Orleans.
Split into simpler sentences: In the 1971 Democratic primary in which Rosenthal ran for the state Senate against Blair and Smith, Oubre sought the office of state attorney general. He lost the party nomination to William J. Guste, of New Orleans.