Complex sentence: She began her national news career when she joined CBS News as the anchor of the "CBS Morning News" in the spring of 1985; at age 28, she was one of the youngest national news anchors.
Split into simpler sentences: She began her national news career when she joined CBS News as the anchor of the "CBS Morning News" in the spring of 1985. At age 28, she was one of the youngest national news anchors.