Task: Sentence Expansion
Input (English): Tiberius Claudius Cogidubnus was a 1st century king of the Regnenses in early Roman Britain .
Output (English): Tiberius Claudius Cogidubnus ( or Togidubnus , Togidumnus or similar , see naming difficulties ) was a 1st-century king of the Regnenses or Regni tribe in early Roman Britain .