Complex sentence: The tour was designed by Colonial Secretary Joseph Chamberlain with the support of Prime Minister Lord Salisbury to reward the dominions for their participation in the South African War of 1899--1902.
Split into simpler sentences: The tour was designed by Colonial Secretary Joseph Chamberlain with the support of Prime Minister Lord Salisbury. Its primary goal was to reward the dominions for their participation in the South African War of 1899--1902.