Complex sentence: From July 1998 to January 2000, Pascual served as Special Assistant to the President and NSC Senior Director for Russia, Ukraine and Eurasia, and from 1995 to 1998 as Director for the same region.from October 2000 until August 2003, as the U.S. Ambassador to Ukraine.
Split into simpler sentences: From July 1998 to January 2000, Pascual served as Special Assistant to the President and NSC Senior Director for Russia, Ukraine and Eurasia, and from 1995 to 1998 as Director for the same region. From October 2000 until August 2003, as the U.S. Ambassador to Ukraine.