Complex sentence: His second wife was the former Barbara Wagner, a double bassist in the Berlin Symphony Orchestra; they they had two sons, the conductor Stefan Sanderling, who in 2002 became music director of the Florida Orchestra, and the cellist/conductor Michael Sanderling.
Split into simpler sentences: His second wife was the former Barbara Wagner, a double bassist in the Berlin Symphony Orchestra. Together they had two sons, the conductor Stefan Sanderling and the cellist and conductor Michael Sanderling.