Complex sentence: After further revisions of the proposals for federation, agreement was reached and following a successful referendum in Southern Rhodesia, Northern Rhodesia joined the Federation of Rhodesia and Nyasaland when it was created in 1953.
Split into simpler sentences: After further revisions of the proposals for federation, agreement was reached. Following a positive referendum result in Southern Rhodesia, Northern Rhodesia joined the Federation of Rhodesia and Nyasaland when it was created in 1953.