Complex sentence: The English had investments in the country through the British Empire, which they did not want to see affected by the disastrous Paraguayan War; following the war, many politicians in Argentina proposed splitting the country between two of the victors, Brazil and Argentina.
Split into simpler sentences: The English had investments in the country through the British Empire, which they did not want to see affected by the disastrous Paraguayan War. Following the war, many politicians in Argentina proposed splitting the country between two of the victors, Brazil and Argentina.