Complex sentence: He was previously regional development minister in the Russian cabinet headed by Viktor Zubkov and in 2004-2007 he served as presidential plenipotentiary representative in the Southern Federal District (North Caucasus and Southern European Russia).
Split into simpler sentences: He was previously a regional development minister in the Russian cabinet, headed by Viktor Zubkov. From 2004 to 2007, he served as Presidential Plenipotentiary Representative in the Southern Federal District (North Caucasus and Southern European Russia).