While the U.S. is a dominant supplier in such retail food product areas as prunes, raisins, almonds and confectionery sunflower seeds, it also holds appreciable shares of several other important markets, such as fish, 
(the U.S.; is; a dominant supplier in such retail food product areas as prunes, raisins, almonds and confectionery sunflower seeds) (it; holds; appreciable shares of several other important markets, such as fish)
the U.S. it
is holds
a dominant supplier in such retail food product areas as prunes, raisins, almonds and confectionery sunflower seeds
appreciable shares of several other important markets, such as fish