Complex sentence: Romanos II or Romanus II (Greek: Ρωμανός Β ΄, "Rōmanos II") (15 March 938--963) succeeded his father Constantine VII as Byzantine emperor in 959 at the age of twenty-one, and died suddenly in 963.
Split into simpler sentences: Romanos II or Romanus II (Greek: Ρωμανός Β ΄, "Rōmanos II") (15 March 938--963) was a Byzantine emperor. He succeeded his father Constantine VII in 959 at the age of twenty-one, and died suddenly in 963.