Complex sentence: Northern Rhodesia was a territory in south central Africa initially administered under charter by the British South Africa Company and formed by it in 1911 by amalgamating North-Western Rhodesia and North-Eastern Rhodesia.
Split into simpler sentences: Northern Rhodesia was a territory in south central Africa, formed in 1911. It was initially administered under charter by the British South Africa Company and formed by it in 1911 by amalgamating North-Western Rhodesia and North-Eastern Rhodesia.