Complex sentence: In 1764 the Cossack Sergeant Stepan Andreyev claimed to have sighted the island, called "Tikegen Land," and found evidence of its inhabitants, the Krahay.
Split into simpler sentences: In 1764 the Cossack Sergeant Stepan Andreyev claimed to have sighted this island. Calling it Tikegen Land, Andreyev found evidence of its inhabitants, the Krahay.