Complex sentence: Darrel P. Kaiser wrote, Kazakh-Kirghiz tribesmen kidnapped 1573 settlers from colonies German settlements in Russia in 1774 alone and only half were successfully ransomed.
Split into simpler sentences: Darrel P. Kaiser wrote, Kazakh-Kirghiz tribesmen kidnapped 1573 German settlers in Russia. In 1774 alone and only half were successfully ransomed.