Complex sentence: He was the editor of "La Prensa"--the only significant opposition newspaper to the long rule of the Somoza family--and husband of Violeta Barrios de Chamorro who later went on to become President of Nicaragua (1990-1996).
Split into simpler sentences: He was the editor of "La Prensa"--the only significant opposition newspaper to the long rule of the Somoza family. He maried Violeta Barrios de Chamorro who later went on to become President of Nicaragua (1990-1996).