Complex sentence: In 1697 he traveled incognito to Europe on an 18-month journey with a large Russian delegation--the so-called "Grand Embassy"--to seek the aid of the European monarchs.
Split into simpler sentences: In 1697 he traveled incognito to Europe on an 18-month journey with a large Russian delegation--the so-called "Grand Embassy". One goal was to seek the aid of the European monarchs.