Complex sentence: Samuel Loring Morison worked as an intelligence analyst at the Naval Intelligence Support Center (NISC) in Suitland, Maryland, from 1974 to 1984, specializing in Soviet amphibious and mine-laying vessels.
Split into simpler sentences: Samuel Loring Morison worked at the Naval Intelligence Support Center (NISC) in Suitland, Maryland, from 1974 to 1984. There he worked as an intelligence analyst specializing in Soviet amphibious and mine-laying vessels.