Complex sentence: He succeeded his father Ar-Zimrathôn as King, ruling Númenor for sixty-nine years, and was succeeded by his son, Ar-Gimilzôr.
Split into simpler sentences: He succeeded his father Ar-Zimrathôn as King. He ruled Númenor for sixty-nine years, and was succeeded by his son, Ar-Gimilzôr.