Complex sentence: Nikephoros II Phokas (Nicephorus II Phocas) ("Nikēphoros II Phōkas") (c.912--10--11 December 969) was Byzantine Emperor (963--969) whose brilliant military exploits contributed to the resurgence of Byzantine Empire in the 10th century.
Split into simpler sentences: Nikephoros II Phokas (Nicephorus II Phocas) ("Nikēphoros II Phōkas") (c.912--10--11 December 969) was Byzantine Emperor from 963 to 969. His brilliant military exploits contributed to the resurgence of Byzantine Empire in the 10th century.