Complex sentence: In a second role, Schwarzkopf served as the Army's senior member on the Military Staff Committee at the United Nations Security Council, where he began to build diplomatic skills in dealings with representatives from other countries.
Split into simpler sentences: In a second role, Schwarzkopf served as the Army's senior member on the Military Staff Committee at the United Nations Security Council. Here, he began to build diplomatic skills in dealings with representatives from other countries.