Complex sentence: The Treaty of Peterswaldau between Great Britain and Russia, July 6,1813, by which the former agreed to support a German legion of ten thousand men in the Russian service.
Split into simpler sentences: The Treaty of Peterswaldau was signed in Peterswaldau on July 6,1813 between Great Britain and Russia. Based on the terms of the accord, Britain agreed to support a German legion of 10,000 men for the Russian service.