Complex sentence: To counter this potential source of Soviet influence, Kennan's solution was to direct economic aid and covert political help to Japan and Western Europe to revive Western governments and prop up international capitalism; by doing so the U.S. would help to rebuild the balance of power.
Split into simpler sentences: To counter this potential source of Soviet influence, Kennan's solution was to direct economic aid and covert political help to Japan and Western Europe in order to revive Western governments and prop up international capitalism. By doing so, the U.S. would help to rebuild the balance of power.