Complex sentence: In 1991, Kijevo was a village of 1,261 people, 99.6% Croats, but surrounded by ethnic Serbian villages of Polača, Civljane and Cetina.
Split into simpler sentences: In 1991, Kijevo was a village of 1,261 people, 99.6% of whom were Croats. It was surrounded by the Serb villages of Polača, Civljane and Cetina.