Complex sentence: In a campaign that was part of the wars known as the Northern Crusades, these knights defeated, subdued and converted the Livonians; in 1208, Pope Innocent III declared that all Livonians had been converted to Christianity.
Split into simpler sentences: In a campaign that was part of the wars known as the Northern Crusades, these knights defeated, subdued and converted the Livonians. In 1208, Pope Innocent III declared that all Livonians had been converted to Christianity.