Complex sentence: Major gold rushes took place in the 19th century in Australia, New Zealand, Brazil, Canada, South Africa and the United States, while smaller gold rushes took place elsewherdummythat resulted was distributed widely because of reduced migration costs and low barriers to entry.
Split into simpler sentences: Major gold rushes took place in the 19th century in Australia, New Zealand, Brazil, Canada, South Africa and the United States, while smaller gold rushes took place elsewhere. The wealth that resulted was distributed widely because of reduced migration costs and low barriers to entry.