Complex sentence: He managed Afghanistan's diplomacy at a critical time with its key strategic partner through extensive interaction with the White House, State Department, Pentagon, U.S. Congress, U.S. media and academia; and initiated Afghanistan's diplomatic relations with Brazil, Argentina, Columbia and Mexico.
Split into simpler sentences: He managed Afghanistan's diplomacy at a critical time with its key strategic partner through extensive interaction with the White House, State Department, Pentagon, U.S. Congress, US. Media and academia; and initiated Afghanistan's diplomatic relations with Brazil, Argentina, Columbia and Mexico.